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BMW Electrical Sensors, Switches, & Relays

Electrical gremlins can be very frustrating. Luckily your BMW's electrical system is better than most, even if it's 25 years old. Here you will find electrical relays, sensors, switches, and modules for the engine, camshaft, and crankshaft. Our parts are OEM, Genuine BMW, or approved aftermarket brands that we have an excellent track record with. There is no middle ground with electrical parts - it either works perfectly or not. And there's nothing more frustrating than a new part that fails right out of the box. So it's important to choose quality replacement parts over a cheap but faulty piece.

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Braille Performance Lightweight AGM Battery - B14115 - 11.5lbs
Braille Performance Lightweight AGM Battery - B14115 - 11.5lbs ...
Braille - Corporate Logo
T#:558037
Part#: B14115
Ships in 5 Business Days
$ 204.99 USD
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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
Braille Performance Lightweight Advanced AGM Battery - B2015 - 15lbs ...
Braille - Corporate Logo
T#:558038
Part#: B2015
Ships in 7 Business Days
$ 237.99 USD
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$ 237.99 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! 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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Braille Lightweight Advanced AGM Battery - B3121 - 21lbs
Braille Lightweight Advanced AGM Battery - B3121 - 21lbs
Braille - Corporate Logo
T#:558042
Part#: B3121
Ships in 6 Business Days
$ 270.99 USD
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$ 270.99 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 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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Braille Performance Intensity Carbon Lithium-ION Battery - i48CX - 10.5lbs
Braille Performance Intensity Carbon Lithium-ION Battery - i48CX - 10...
This item is classified as Hazardous Materials and requires special shipping and handling. We cannot ship this item out of the US or with priority shi
Braille - Corporate Logo
T#:558047
Part#: I48CX
Ships in 4 Business Days
$ 1,164.99 USD
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$ 1,164.99 USD
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The ultra-lightweight, standard height I48CX lithium-ION battery from Braille Battery is a popular choice among BMW enthusiasts looking for a drop-in replacement battery that shaves off a ton of weight, 35 pounds in total! Thanks to the Group 48 design of this battery, no modifications are needed for installation. This is perfect for anyone looking to drive their car both on and off of the track, without any negative side effects, and wants a battery with a 10-15 year life span!
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Valeo Voltage Regulator - Valeo - E53, E60, E63, E64, E70
Valeo Voltage Regulator - Valeo - E53, E60, E63, E64, E70
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Valeo - Corporate Logo
T#:1196078
Part#: 12318510090
Ships in 1 Business Day
$ 91.37 USD
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$ 91.37 USD
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OEM replacement for you BMW alternator fixing charging issues
Voltage Regulator
Voltage Regulator
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Valeo - Corporate Logo
T#:594108
Part#: 12317603775
In Stock
$ 71.22

This product was last offered at the strikethrough price on
05-04-2026

$ 70.45 USD
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$ 70.45 USD
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Have you noticed inconsistent electrical power in your interior lately? Your voltage regulator is responsible for maintaining a constant voltage out from the alternator.
Braille Performance GreenLite Lithium-ION Battery - G30 - 5.5lbs
Braille Performance GreenLite Lithium-ION Battery - G30 - 5.5lbs ...
Braille - Corporate Logo
T#:558046
Part#: G30
Ships on Aug 6, 2026
$ 522.99 USD
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$ 522.99 USD
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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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Alternator
Alternator
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Valeo - Corporate Logo
T#:594101
Part#: 12318570672
In Stock at Vendor
$ 1,094.99

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

$ 1,062.99 USD
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$ 1,062.99 USD
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Replacement Alternator from Valeo
Voltage Regulator
Voltage Regulator
Beru - Corporate Logo
T#:596879
Part#: 12321350052
In Stock at Vendor
$ 41.99

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

$ 40.99 USD
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$ 40.99 USD
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If you are having issues with voltage peaking, lights fading in and out as your driving, or your battery keeps dying despite the car running, It could be the result of a faulty voltage regulator. Voltage regulators control the amount of power coming from the alternator.
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AUTOTECKNIC Dry Carbon Fiber Battery Terminal Cover - G87 M2
AUTOTECKNIC Dry Carbon Fiber Battery Terminal Cover - G87 M2 ...
AUTOTECKNIC - Corporate Logo
T#:21012623
Part#: ATK-BM-0420-G87
Ships in 7 Business Days
$ 495.00 USD
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$ 495.00 USD
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The boldly styled G87 already touts carbon features but carbon fiber is not very often displayed in the engine bay. If you are looking to give your engine bay some carbon spark, AUTOTECKNIC introduces you to their dry carbon battery terminal cover to beautify your engine bay and bring a smile to your face every time you open the hood of your S58 monster! Made from high-quality carbon, this product is sure to stand the test of time!
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Intensity Lithium-ION Battery - i34RX - 11.5lbs
Intensity Lithium-ION Battery - i34RX - 11.5lbs
Braille - Corporate Logo
T#:54388454
Part#: I34RX
Ships in 6 Business Days
New Item
$ 949.99 USD
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$ 949.99 USD
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Whether you're building a dedicated track weapon or upgrading your street machine for ultimate reliability, unsprung and upper-chassis weight is the enemy of performance. Positioned high up in the engine bay or rear corners, a heavy factory battery negatively impacts your car's center of gravity.
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Remanufactured Alternator - 170A
Remanufactured Alternator - 170A
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Valeo - Corporate Logo
T#:594098
Part#: 12317802929
Ships on Aug 6, 2026
$ 323.99 USD
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$ 323.99 USD
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Replacement Alternator from Valeo
MINI N14 N18 Alternator - 120 Amp 439617
MINI N14 N18 Alternator - 120 Amp 439617
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Valeo - Corporate Logo
T#:28803228
Part#: 12317619254
In Stock
$ 374.99 USD
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$ 374.99 USD
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MINI N14 N18 Alternator is an essential component for powering the electrical system of your Mini. Engineered to provide reliable performance, this alternator ensures your Mini stays running smoothly. Upgrade your Mini with this genuine alternator for dependable power generation.

  • Powers the electrical system
  • Reliable performance
  • Ensures smooth operation
  • Genuine Mini part
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Alternator
Alternator
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Valeo - Corporate Logo
T#:594102
Part#: 12311247288
Back Ordered
$ 547.99

This product was last offered at the strikethrough price on
05-08-2026

$ 532.99 USD
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$ 532.99 USD
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Replacement Alternator from Valeo

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