When do spark plug wires need to be replaced?

The lifespan of spark plug wires varies based on factors including the climate and driving habits, but they generally last about 60,000-100,00 miles. Periodic replacement helps maintain the engine’s performance.

What are signs spark plug wires should be replaced?

Common signs of wear can include a rough-running engine, possible misfires and even hard starting. Acceleration can be affected and fuel economy can decline. Visually, cracks or fraying of the wires are signs replacement is needed.

Are all spark plug wires the same?

No. Material composition and design can vary widely, resulting in varying levels of conductivity, durability and electrical interference suppression. GM Genuine Parts and ACDelco Gold Spark Plug Wires meet GM factory specifications.

Do battery cables need to be replaced often?

Generally, battery cables don't need periodic replacement, but they are subject to corrosion and other forces of wear that can affect their performance. This is especially true in climates of high humidity, where the roads are salted in the winter.

What are signs of the battery cables need to be replaced?

If loose connections are ruled out, hard starting, a failure to start and other intermittent electrical issues are common signs the battery cables should be checked for corrosion and other signs of wear.

Gm Genuine Parts 12135037 Multi Function Diode

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

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Description

⚡ Power your ride with precision—only Genuine GM parts deliver the perfect fit!

LIGHTWEIGHT COMPACT - At just 10 grams and 3.3 x 2.79 x 0.76 cm, it fits discreetly without adding bulk.
EFFORTLESS INSTALLATION - Precision fit ensures quick, hassle-free replacement—no guesswork, no downtime.
RELIABILITY YOU CAN TRUST - Tested and warranted by GM to meet original equipment standards for peak performance.
SEAMLESS OEM COMPATIBILITY - Designed exclusively for Chevrolet, Buick, GMC, and Cadillac for flawless integration.
BACKED BY GENUINE GM SUPPORT - Access expert installation help at your nearest GM dealer or certified service center.

The GM Genuine Parts 12135037 Multi-Function Diode is a compact, lightweight inline diode engineered specifically for GM vehicles. It guarantees a precise fit and reliable performance, meeting GM Original Equipment standards. Ideal for maintaining electrical integrity in Chevrolet, Buick, GMC, and Cadillac models, it comes with GM’s warranty and expert support for seamless installation.

Reviews

B**N

Functional diode

Works as intended. Bought this for the alternator I installed in the tractor.

16.11.2025

M**R

diode

worked good.

16.04.2026

M**.

Performs as intended

I have several older model vehicles. Both With AGM type batteries, however the original electrical system and alternator were designed for the original flooded lead cell acid battery design. This diode is a game changer in improving the performance of the charging system on these older vehicles. So that the AGM battery can fully charge. This diode fits with some very minor modifications . You have to trim away some of the plastic casing around the diode so that it will fit in to the fuse slot correctly . Performs well in my vehicles, 89 & 97 Toyota land Cruisers.

30.06.2024

C**D

Diode for alternator priming

Diode fits an inline fuse holder and together these provide a sturdy way to feed the alternator field coil the required starting current while preventing battery drain when ignition is off.

27.04.2024

J**S

works well

replaced my alternator fuse with this diode in my old Toyota to increase voltage output as i run AGM style batteries. will work with 3 wire alternators. this diode is the size of a mini fuse, but will fit in an ATC size fuse holder

26.02.2024

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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€ 90.47

Duties & taxes included

In stock

Sold byAmazon GERMANYDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to GERMANY.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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ASIN	B08WHLPQR3
Best Sellers Rank	309,264 in Automotive ( See Top 100 in Automotive ) 377 in Car Fuses
Brand	GM GENUINE PARTS
Customer Reviews	4.6 4.6 out of 5 stars (313)
Date First Available	12 April 2022
Exterior	Machined
Item Weight	10 g
Item model number	12135037
Manufacturer	GM Genuine Parts
Manufacturer part number	12135037
Model	GM Original Equipment
Product Dimensions	3.3 x 2.79 x 0.76 cm; 10 g

GM Genuine Parts 12135037 Multi-Function Diode

Description

Specifications

Reviews

Common Questions