BMW Electrical Sensors, Switches, & Relays for BMW E21 320i M10 1.8L

Genuine BMW 5 Prong Salmon Relay - Multiple BMWs

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T#:5390

Part#: 12631742690

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$ 22.99 USD

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This relay is used for the SMG system on the E46 M3 and various applications including secondary air systems on other BMW's. If you find that your SMG-equipped E46 M3 is not starting, this is one of the first places to check as it controls power to the hydraulic unit (the car will not start without hydraulics). Buy one to fix the issue and buy a second so you're not stranded in the future!

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Braille Performance Lightweight AGM Battery - B14115 - 11.5lbs ...

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T#:558037

Part#: B14115

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$ 204.99 USD

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When building a car for the track, one of the most important factors to consider is weight. Stock batteries can weigh up to almost 50 pounds and are unnecessarily large, designed to power a host of systems not normally used in a track car (radios, lighting, etc.). What can you do to cut weight the weight without affecting your cars operation? This is where Braille Battery comes in with their long line of performance lightweight battery options! Designed to provide the highest cranking power possible while being up to 75% lighter, Braille Battery is one of the foremost leaders in automotive racing batteries with nothing but high quality, high output batteries in mind!

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Braille Performance Lightweight Advanced AGM Battery - B2015 - 15lbs ...

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T#:558038

Part#: B2015

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When building a car for the track, one of the most important factors to consider is weight. Stock batteries can weigh up to almost 50 pounds and are unnecessarily large, designed to power a host of systems not normally used in a track car (radios, lighting, etc.). What can you do to cut weight the weight without affecting your cars operation? This is where Braille Battery comes in with their long line of performance lightweight battery options! Designed to provide the highest cranking power possible while being up to 75% lighter, Braille Battery is one of the foremost leaders in automotive racing batteries with nothing but high quality, high output batteries in mind! The B2015 is Braille's most popular non-carbon racing battery and is able to start larger engines easily for racing and offers daily driving capability for most 4 and 6 cylinders engine vehicles. Physical Specifications: BCI Group: All sizes Weight: 15lbs / 6.8kg Length: 6.8" / 173mm Width: 3.4" / 86mm Height: 6.1" / 155mm Polarity: Right Side Positive Performance Specifications: Voltage: 12 Full Charge Voltage: 13.2 Pulse Cranking Amps (PCA): 1067 Amp Hour (AH): 21 Life Cycle @ 10% DOD: 3100 *THIS BATTERY REQUIRES A CUSTOM MOUNTING SOLUTION. The size and weight are significantly smaller than a stock battery and will not be held in place by the stock battery mount*

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Schwaben Automatic Battery Tender

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T#:378277

Part#: 005979SCH01A

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This Schwaben Battery Charger is designed to work on 6 or 12 volt Lead-acid batteries only, includes WET, MF,AGM and GEL types. Do not use on dry cell batteries commonly used in appliances. Charger features, Charging voltage auto select. Selectable Charging current,8 LED indicators, No risk of overcharging, overheating protection, Short circuit protection.

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Genuine BMW Oil Pressure Switch

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T#:141613

Part#: 61311243414

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$ 27.99 USD

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Genuine BMW Oil Pressure Switch - M12X1,5

Braille Lightweight Advanced AGM Battery - B3121 - 21lbs

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T#:558042

Part#: B3121

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When building a car for the track, one of the most important factors to consider is weight. Stock batteries can weigh up to almost 50 pounds and are unnecessarily large, designed to power a host of systems not normally used in a track car (radios, lighting, etc.). What can you do to cut weight the weight without affecting your car's operation? This is where Braille Battery comes in with their long line of performance lightweight battery options! Designed to provide the highest cranking power possible while being up to 75% lighter, Braille Battery is one of the foremost leaders in automotive racing batteries with nothing but high quality, high output batteries in mind! The B3121 battery from Braille is their lightest do-everything battery available, offering 1380 pulse cranking amps that can crank over V8 engines with ease while still coming in at under 22 pounds, half of the weight of a standard Group 34 battery! This is thanks to their Advanced AGM racing technology that allows them to put a ton of power into a very small package. Physical Specifications: BCI Group: All sizes Weight: 21lbs / 9.5kg Length: 6.6" / 168mm Width: 5.2" / 132mm Height: 6.8" / 173mm Polarity: Right Side Positive Terminal Type: Steel terminal block with M6 bolt Performance Specifications: Voltage: 12v Recharge Voltage: 14.4V – 14.6V Maintenance charge voltage: 13.8V 5s Pulse Cranking Amps (PCA): 1380 10s PDC: 124 Amp Hour (Ah): 31 Watt Hour (Wh): 372 Life Cycle @ 10% DOD: 3100 Charging Temperature 0C to 50C Discharge Temperature range -40C to +60C Storage temperature -40C to +60C *THIS BATTERY REQUIRES A CUSTOM MOUNTING SOLUTION. The size and weight are significantly smaller than a stock battery and will not be held in place by the stock battery mount*

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100 Piece Mini Car Fuse Assortment

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T#:383674

Part#: ATD382

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You never know when you will blow a fuse so it always good to have extra

OEM Bosch Voltage Regulator (Bosch Alternator) - 12311726022 ...

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T#:19326

Part#: 12311726022

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$ 71.99

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This is the voltage regulator found on the back of the alternator. It's a normal wear item and the contacts are the first thing to check if you believe the alternator is not charging the battery (lights flickering or dim, battery light on in the dash, the engine quits without warning, or other electrical failures). The voltage regulator manages the voltage flowing through the car, especially to and from the battery. There are two carbon contacts on the regulator that control the magnetic field when the alternator is spinning and these contacts wear over time. A new set of contacts will be about 13mm in length. Anything less than 5mm and the voltage regulator should be replaced, regardless if that is the cause of your electrical problems or not. Most older mechanics will tell you to keep a spare regulator in your toolbox.

The carbon contacts can be replaced on their own but requires desoldering the old ones from the base and then soldering the new ones on. It may be easier to just replace the unit as a whole.

This is the OEM voltage regulator, made by Bosch or Hella. It's the one with the white base and fits most Bosch alternators from 1977-1995 (Valeo and other alternators look very different and have a black cover and base). This part number replaces the previous BMW part numbers - 12311271664, 12321279548, 12311722755, 12321711399 and Bosch part numbers 1197311021 and 1197311028.

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Innovate LC-2 Wideband O2 Controller Kit

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T#:28836410

Part#: 38770

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$ 212.99 USD

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Features & Benefits:

Two configurable linear 0-5V analog outputs Ability to calibrate O2 sensors for maximum accuracy Includes LC-2 controller and Bosch wideband O2 sensor Comes with a program cable, manual, and a 10 ft. sensor cable Includes a 1-inch mild steel exhaust bung Innovate MTS serial in/out capability Integrated dual-color status LED (green/red) Patented DirectDigital™ wideband sensor control Positive lock connectors for all connections Real-time display data on screen or with the powerful LogWorks software Range:

AFR (Air-Fuel Ratio) range from 7.4:1 to 22.4:1 (0.5 to 1.5 lambda)

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Genuine BMW Alternator Bushing (20 mm Length) - E10 E12 E21 E23 E24 E...

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T#:22410

Part#: 12311268447

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Genuine BMW Bush - 90 Shore Lang

This item fits the following BMW Chassis:
E30 M3,E30

Fits BMW Engines including:
M10,M20,M30,S14,S38

Superior Bass Sports Horn Kit 330Hz + 400Hz 112Db

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T#:31158805

Part#: 85115

Ships on Jul 30, 2026

$ 77.99 USD

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Superior Bass Sports Horn Kit 330Hz + 400Hz 112Db

The Superior Bass Sports Horn Kit 330Hz + 400Hz 112Db is designed to make sure your presence is known with powerful, attention-grabbing sound. These high-performance sports horns feature:

Impressive Loudness: Delivers a powerful 112 decibels, ensuring you’re heard in any situation.
Dual Frequency: Includes 330Hz and 400Hz horns for a dynamic and distinct sound.
Lightweight & Durable: Constructed for easy installation with weather-resistant covers, built to withstand the elements.
Easy Installation: Quick and straightforward to install, enhancing vehicle safety with minimal effort.

The kit is a must-have for anyone looking to enhance their vehicle’s horn performance and visibility on the road.

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Genuine BMW Socket repair kit

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T#:207094

Part#: 61132359996

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Genuine BMW Rep. Kit For Socket Housing - 4 Pol.
This item fits the following BMW Chassis:
E46 M3,E46,E85 Z4,E90,F30,F31,F32,F33,F34,F36,F80 M3,F82 M4,F83

Braille Performance GreenLite Lithium-ION Battery - G30 - 5.5lbs ...

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T#:558046

Part#: G30

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The G30 lithium battery from Braille is designed for the Import Tuner market (4 and 6 cylinder) for track use and has enough power for small black V8 race cars and hot rods with light electrical demands/accessories and standard compression. The G30 comes in the popular ETX 30 Group size, just like the B3121 AGM, so it is small and light enough to mount in a variety of locations. Incorporated in this battery is the same technology used in their race winning batteries used by nearly every OEM developer in classes ranging from SCCA to Formula 1.

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Bass Tone Sports Horn Kit 400Hz + 500Hz, 115Db

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T#:31589317

Part#: 85110

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OMP Battery Cut Off Switch / Kill Switch

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T#:1614

Part#: EA-462

Back Ordered

$ 65.00 USD

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OMP Battery Cut Off Switch / Kill Switch, for use in racecars as an emergency "kill switch", to depower the electrical system in the event of a crash or other emergency. This cut off switch is FIA approved, has 6 poles and alternator protection, as well as a removable key.

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Hella Hella Horn - Low Tone

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T#:590880

Part#: 2768082

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$ 36.99 USD

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Disc Type Low-Tone, 12 V, 335 Hz with Bracket

Hella Hella Horn - High Tone

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T#:592707

Part#: 2768551

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Disc Type High-Tone, 12 V, 400 Hz with Bracket

Precision Raceworks Ethanol Sensor Breakout Harness

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T#:35559424

Part#: 201-0411

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$ 35.99

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n Ethanol Sensor Breakout Harness provides a clean wiring solution by splitting the signal from your ethanol content sensor between two analyzers, such as an ECU/controller and a gauge or Bluetooth display, without modifying your existing harness.his setup enables real-time ethanol level monitoring and facilitates comprehensive DME/ECU adjustments for enhanced automotive performance.citeturn0search0

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Genuine BMW Positive Battery Cable - E21 320i

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T#:39337

Part#: 12421732447

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$ 68.99 USD

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Genuine BMW BATTERY CABLE (PLUS POLE)

OEM Schaeffler Alternator Bearing - BMW E21 E30 E36 E12 E28 E34 E23 E...

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T#:41965072

Part#: 6201-Z

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Offered by OEM Schaeffler, this bearing replaces BMW part number 12311739203, which is found in numerous BMW alternators manufactured prior to 1996. This bearing helps to stabilize the shaft of the alternator, allowing it to spin freely. If you are experiencing a loud squeaking or grinding noise from your alternator, there is a good chance one of the internal bearings has failed and needs to be replaced.

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Hella Air Horn Kit

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T#:592708

Part#: 3001651

In Stock at Vendor

$ 143.99

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05-07-2026

$ 139.99 USD

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Get noticed with this air horn kit from Hella!

Genuine BMW Alternator Brush Set

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T#:7133

Part#: 12311727756

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Genuine BMW Carbon Brush Set

This item fits the following BMW Chassis:
E30 M3,E34 M5,E30,E34,E36

Fits BMW Engines including:
M10,M20,M30,M42,M50,M70,S14,S38,S70

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Genuine BMW Temperature Sensor

For vehicles with a production date from 09/1979

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T#:200307

Part#: 13621362599

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8% off MSRP $ 255.99

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$ 234.99 USD

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$ 255.99

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Genuine BMW Temperature-Time Switch

Genuine BMW Alternator Bushing (Red) (8 mm Length) - E10 E12 E21 E23 ...

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T#:22411

Part#: 12311268449

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5% off MSRP $ 40.99

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$ 38.99 USD

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$ 40.99

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Genuine BMW Bush - 90 Shore Kurz

Fits BMW Engines including:
M10,M20,M30

Fan Wheel - E10, E12, E21, E23, E24, E28, E3, E9

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T#:38759

Part#: 12311350199

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6% off MSRP $ 53.99

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$ 50.99 USD

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Genuine BMW FAN WHEEL

Fits BMW Engines including:
M10,M20,M30

Supporting Bracket - E10, E21

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T#:39076

Part#: 12318602032

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$ 77.99 USD

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Genuine BMW SUPPORTING BRACKET

Fits BMW Engines including:
M10

Woodruff Key

4X5

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T#:28561

Part#: 07119951453

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$ 3.99 USD

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$ 3.99 USD

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Genuine BMW Woodruff Key
This item fits the following BMW Chassis:
E30 M3,E70 X5M,E71 X6M,E53 48IS,E30,E34,E36,E53 X5 X5,E63,E65,E70 X5,E71 X6,F01,F02,F06,F10,F12,F13,F15,F16

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LK-2M 2 Pin Connector Package

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T#:40072446

Part#: LK2M

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$ 4.79 USD

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Includes connector housing with terminals and seals. Commonly used for the engine oil pressure switch.

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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Electrical Connector - Priced Each

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T#:367145

Part#: 61132359999

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$ 18.99 USD

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2 pin used in many locations on late model BMWs

Cloth Webbed Adhesive Tape - 7.5 Meters

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T#:42873702

Part#: 61135B70D27

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$ 11.99 USD

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Alternator / PS / AC Idler Nut

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T#:7139

Part#: 12317677914

In Stock

$ 15.24

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$ 15.23 USD

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GENUINE BMW ENGINE ELECTRICAL IDLER 12317677914

Repair Kit For Socket

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T#:528834

Part#: 61132359992

In Stock

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$ 13.99 USD

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$ 14.99

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Genuine BMW Terminal Socket - Mcon 2.8 - Multiple BMWs

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T#:40627

Part#: 12527567482

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$ 0.99 USD

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Used in a wide variety of BMW connectors, these terminal sockets can come in handy when working on your wiring components.

Schwaben Self-Adjusting Wire Stripper/Cutter/Crimper

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T#:37622217

Part#: 3774SCH01A

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$ 19.54 USD

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Schwaben's Self-Adjusting Wire Strippers are an essential addition to any garage or toolbox. Engineered with precision and versatility, these wire strippers automatically adapt to various wire sizes, making them perfect for a wide range of automotive and electrical applications.

Crafted with Schwaben's renowned quality standards, this tool ensures reliable performance and long-lasting durability, helping you tackle wiring tasks efficiently and accurately. Whether you're a professional mechanic or a DIY enthusiast, these wire strippers are your go-to solution for seamless and precise wiring repairs.

Key Features:

Ergonomic Design: 6-inch handles with rubber grips provide superior comfort and control during use. Self-Adjusting Stripper Jaws: Serrated jaws offer a secure grip for consistent and accurate stripping. Adjustable Depth Gauge: Enables precise, repeatable wire stripping to match your project’s needs. Wide Range Compatibility: Strips wires ranging from 10 to 24 AWG with ease. Integrated Wire Cutter: Effortlessly slices wires between 10 and 24 AWG. Built-In Crimper: Crimps both insulated and non-insulated wires in sizes from 10 to 22 AWG. Schwaben’s Self-Adjusting Wire Strippers combine precision, convenience, and durability into one must-have tool, ensuring professional results for every project.

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Genuine BMW Electrical Connector Repair Kit - Multiple BMWs ...

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T#:206288

Part#: 61132359999

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$ 19.99 USD

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This is a Genuine BMW 2 pin connector that is used in many places by BMW.

Hella Horn - Low-Tone

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T#:28869559

Part#: 7424001

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$ 17.99 USD

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Universal fit. Not direct fit.

Hella Relay

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T#:592718

Part#: 965400001

In Stock

$ 14.99 USD

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12V 30A SPST relay with bracket

Febi Alternator Mount Bushing - E12, E21, E23, E24, E28, E30 ...

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T#:381815

Part#: 12311268433

In Stock

$ 3.99

This product was last offered at the strikethrough price on
12-18-2025

$ 2.99 USD

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$ 2.99 USD

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Reduces alternator vibration.

Liqui-Moly Battery Clamp Grease - 50 grams

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T#:1195997

Part#: 20244

In Stock

$ 7.79

This product was last offered at the strikethrough price on
02-24-2026

$ 6.69 USD

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Excellent corrosion protection for your battery and other connections

15A Fuse - Priced Each

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T#:375327

Part#: 61131372626

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$ 2.03 USD

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$ 2.03 USD

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120 pc Fuse Assortment

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T#:1809154

Part#: W5368

Ships in 2 Business Days

$ 13.68 USD

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A must for any toolbox.

OEM Bosch Starter Relay - E21 320i

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T#:583822

Part#: 61311243207

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$ 4.99 USD

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$ 4.99 USD

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This is a brand new starter relay from OEM supplier Bosch. If you have replaced your starter and have ruled out every other issue, this relay could restore your starters operation and get your car back up and running.

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Battery Tender Plus Advanced Battery Charging System

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T#:49892371

Part#: BTT0210128

In Stock at Vendor

$ 69.99 USD

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$ 69.99 USD

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Hella 5-Prong Fuel Injection Relay - E21, E23, E24, E28, E30, E34 ...

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T#:7175

Part#: 12631708646

In Stock at Vendor

$ 22.99

This product was last offered at the strikethrough price on
01-05-2026

$ 20.99 USD

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$ 20.99 USD

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This part has been superseded to BMW Part 12631708647

Dielectric Tune-Up Grease 3oz Tube

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T#:3672391

Part#: 22058

In Stock at Vendor

$ 19.99

This product was last offered at the strikethrough price on
05-07-2026

$ 18.99 USD

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$ 18.99 USD

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Protects electrical connections and wiring from salt, dirt and corrosion

Temperature Sensor

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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:29898445

Part#: 13621362599

In Stock at Vendor

$ 283.99

This product was last offered at the strikethrough price on
04-10-2026

$ 262.99 USD

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Qty

$ 262.99 USD

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Genuine BMW Temperature-Time Switch

Washer - E12, E21, E23, E24, E28, E30

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T#:38719

Part#: 12311268420

Ships in 1-2 days

$ 10.99 USD

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$ 10.99 USD

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Genuine BMW Washer

This item fits the following BMW Chassis:
E30 M3,E30

Fits BMW Engines including:
M10,M20,M30,S14,S38

Genuine BMW Universal Socket Housing

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T#:21280

Part#: 61138352304

Ships in 1-2 days

7% off MSRP $ 28.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 26.99 USD

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Qty

7% off MSRP

$ 28.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 26.99 USD

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Genuine BMW Universal Socket Housing, Uncoded - 3 Pol.
This item fits the following BMW Chassis:
E36 M3,E34 M5,E39 M5,E60 M5,E46 M3,E70 X5M,E71 X6M,E82 1M Coupe,E53 48IS,E34,E36,E38,E39,E46,E53 X5,E65,E70 X5,E71 X6,E82,E83 X3,E89 Z4,E90,F01,F02,F06,F10,F12,F13

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