ECS Heavy Duty Ground Cable Upgrade (12421737755) - E30, E36, E39, E46
If you're experiencing hard starting, flaky charging, or other electrical issues, your engine ground strap may be the culprit. On older BMWs, the engine ground strap is a thin, non-insulated cable that spans from the engine mount arm to the frame horn. Despite the seemingly simple nature of this part, on older cars, it is known to cause massive headaches. Due to its non-insulated design, years of exposure to water, dirt, and road salt will cause the wire to corrode, ultimately leading to complete failure. A break in this cable will cause an open circuit, resulting in issues with the vehicle's electrical system and potentially leading to a no-start condition.
To solve this issue, ECS has engineered an exact-fit, upgraded ground strap for your BMW! Unlike its OEM counterpart, this design features insulated, large-gauge copper wire for dependable conductivity and long-lasting durability. Additionally, factory-style lugs are zinc-coated, crimped, and soldered, ensuring protection against corrosion and oxidation.
Whether you're replacing a visibly corroded strap or proactively preventing failure, this solution from ECS is sure to provide lasting performance and protection.
FEATURES
Direct-fit replacement and upgrade for E30 (318i/is), E36, E39, E46, and others Solves intermittent grounding issues caused by aging OEM straps Clean, stealthy design that fits seamlessly in factory engine bays Factory length and lug orientation for drop-in fitment 2 AWG tinned copper cable for excellent conductivity and corrosion resistance Zinc-coated lugs, crimped and soldered to resist moisture and oxidation Black UL1015-grade insulation withstands oil, heat, and abrasion Discreet ECS label for a clean, OEM+ look Replaces OEM part numbers 12421737755 and 12421714262.
Please ensure your correct model is selected
Does NOT fit your Change Vehicle
Fits your Change Vehicle
This product was last offered at the strikethrough price on
06-14-2026
Lifetime Replacement Program! Read more here
Product Details
If you're experiencing hard starting, flaky charging, or other electrical issues, your engine ground strap may be the culprit. On older BMWs, the engine ground strap is a thin, non-insulated cable that spans from the engine mount arm to the frame horn. Despite the seemingly simple nature of this part, on older cars, it is known to cause massive headaches. Due to its non-insulated design, years of exposure to water, dirt, and road salt will cause the wire to corrode, ultimately leading to complete failure. A break in this cable will cause an open circuit, resulting in issues with the vehicle's electrical system and potentially leading to a no-start condition.
To solve this issue, ECS has engineered an exact-fit, upgraded ground strap for your BMW! Unlike its OEM counterpart, this design features insulated, large-gauge copper wire for dependable conductivity and long-lasting durability. Additionally, factory-style lugs are zinc-coated, crimped, and soldered, ensuring protection against corrosion and oxidation.
Whether you're replacing a visibly corroded strap or proactively preventing failure, this solution from ECS is sure to provide lasting performance and protection.
FEATURES
- Direct-fit replacement and upgrade for E30 (318i/is), E36, E39, E46, and others
- Solves intermittent grounding issues caused by aging OEM straps
- Clean, stealthy design that fits seamlessly in factory engine bays
- Factory length and lug orientation for drop-in fitment
- 2 AWG tinned copper cable for excellent conductivity and corrosion resistance
- Zinc-coated lugs, crimped and soldered to resist moisture and oxidation
- Black UL1015-grade insulation withstands oil, heat, and abrasion
- Discreet ECS label for a clean, OEM+ look
Replaces OEM part numbers 12421737755 and 12421714262.
Prop 65 Warning- 12421737755
- 12421714262
- 12421724740
Product Q&A
Lifetime Replacement
This Product Is Covered By Our Lifetime Replacement Program
Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.
If you have any questions, would like to learn more or are ready to place a replacement claim, click here!
Fits These Cars
| MAKE | MODEL | SUBMODEL | ENGINE | Special Fitment Notes |
|---|---|---|---|---|
| BMW | E30 | 318i | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E30 | 318is | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E30 | 318i | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E30 | 318is | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E31 | 840Ci | M60 4.0L | Use vehicle selector to confirm fitment |
| BMW | E31 | 840Ci | M62 4.4L | Use vehicle selector to confirm fitment |
| BMW | E31 | 850Ci | M70 5.0L | Use vehicle selector to confirm fitment |
| BMW | E31 | 850Ci | M73 5.4L | Use vehicle selector to confirm fitment |
| BMW | E31 | 850CSi | S70 5.6L | Use vehicle selector to confirm fitment |
| BMW | E31 | 840Ci | M60 4.0L | Use vehicle selector to confirm fitment |
| BMW | E31 | 840Ci | M62 4.4L | Use vehicle selector to confirm fitment |
| BMW | E31 | 850Ci | M70 5.0L | Use vehicle selector to confirm fitment |
| BMW | E31 | 850Ci | M73 5.4L | Use vehicle selector to confirm fitment |
| BMW | E31 | 850CSi | S70 5.6L | Use vehicle selector to confirm fitment |
| BMW | E32 | 735i | M30 3.4L | Use vehicle selector to confirm fitment |
| BMW | E32 | 735iL | M30 3.4L | Use vehicle selector to confirm fitment |
| BMW | E32 | 750i | M70 5.0L | Use vehicle selector to confirm fitment |
| BMW | E32 | 750iL | M70 5.0L | Use vehicle selector to confirm fitment |
| BMW | E32 | 735i | M30 3.4L | Use vehicle selector to confirm fitment |
| BMW | E32 | 735iL | M30 3.4L | Use vehicle selector to confirm fitment |
| BMW | E32 | 750iL | M70 5.0L | Use vehicle selector to confirm fitment |
| BMW | E34 | 525i | M20 2.5L | Use vehicle selector to confirm fitment |
| BMW | E34 | 535i | M30 3.4L | Use vehicle selector to confirm fitment |
| BMW | E34 | 525i | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E34 | 530i | M60 3.0L | Use vehicle selector to confirm fitment |
| BMW | E34 | 540i | M60 4.0L | Use vehicle selector to confirm fitment |
| BMW | E34 | 525i | M20 2.5L | Use vehicle selector to confirm fitment |
| BMW | E34 | 525i | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E34 | 535i | M30 3.4L | Use vehicle selector to confirm fitment |
| BMW | E34 | 540i | M60 4.0L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318i | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318i | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ic | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ic | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318is | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318is | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ti | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ti | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 320i | M50 2.0L | Use vehicle selector to confirm fitment |
| BMW | E36 | 323i | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 323ic | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 323is | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325i | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325ic | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325is | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328i | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328ic | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328is | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | M3 | S50 3.0L | Use vehicle selector to confirm fitment |
| BMW | E36 | M3 | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318i | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318i | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ic | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ic | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318is | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318is | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | E36 | 318ti | M42 1.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 323ic | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 323is | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325i | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325ic | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 325is | M50 2.5L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328i | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328ic | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | 328is | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E36 | M3 | S50 3.0L | Use vehicle selector to confirm fitment |
| BMW | E36 | M3 | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | E38 | 740i | M60 4.0L | Use vehicle selector to confirm fitment |
| BMW | E38 | 740i | M62 4.4L | Use vehicle selector to confirm fitment |
| BMW | E38 | 740iL | M60 4.0L | Use vehicle selector to confirm fitment |
| BMW | E38 | 740iL | M62 4.4L | Use vehicle selector to confirm fitment |
| BMW | E38 | 750i | M73 5.4L | Use vehicle selector to confirm fitment |
| BMW | E38 | 750iL | M73 5.4L | Use vehicle selector to confirm fitment |
| BMW | E38 | 740i | M60 4.0L | Use vehicle selector to confirm fitment |
| BMW | E38 | 740i | M62 4.4L | Use vehicle selector to confirm fitment |
| BMW | E38 | 740iL | M60 4.0L | Use vehicle selector to confirm fitment |
| BMW | E38 | 740iL | M62 4.4L | Use vehicle selector to confirm fitment |
| BMW | E38 | 750iL | M73 5.4L | Use vehicle selector to confirm fitment |
| BMW | E39 | 525i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E39 | 528i | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E39 | 530i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E39 | 540i | M62 4.4L | Use vehicle selector to confirm fitment |
| BMW | E46 | 323Ci | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 323i | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325Ci | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325xi | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 328Ci | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E46 | 328i | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330Ci | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330xi | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | M3 | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | E46 | 323Ci | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 323i | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325Ci | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 325xi | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | E46 | 328Ci | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E46 | 328i | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330Ci | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | 330xi | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | E46 | M3 | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 1.9 | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.3 | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.5 | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.5i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.8 | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 3.0i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Coupe | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Coupe | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Roadster | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Roadster | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 1.9 | M44 1.9L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.3 | M52 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.5i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 2.8 | M52 2.8L | Use vehicle selector to confirm fitment |
| BMW | Z3 | 3.0i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Coupe | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Coupe | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Roadster | S52 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z3 | M Roadster | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z4 | 2.5i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z4 | 3.0i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | Z4 | M Coupe | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z4 | M Roadster | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z4 | 2.5i | M54 2.5L | Use vehicle selector to confirm fitment |
| BMW | Z4 | 3.0i | M54 3.0L | Use vehicle selector to confirm fitment |
| BMW | Z4 | M Coupe | S54 3.2L | Use vehicle selector to confirm fitment |
| BMW | Z4 | M Roadster | S54 3.2L | Use vehicle selector to confirm fitment |
Select Your Vehicle
Selected Options
Upload Image
ECS Heavy Duty Ground Cable Upgrade (12421737755) - E30, E36, E39, E46
Tips & Guidelines
Upload Video
ECS Heavy Duty Ground Cable Upgrade (12421737755) - E30, E36, E39, E46
Tips & Guidelines
Sorry, I don't understand this YouTube link.
Video successfully uploaded. Your video will appear once it is approved.
Upload Document
ECS Heavy Duty Ground Cable Upgrade (12421737755) - E30, E36, E39, E46