---
product_id: 425810103
title: "GM Genuine Parts 12135037 Multi-Function Diode"
brand: "gm genuine parts"
price: "11.94 OMR"
currency: OMR
in_stock: true
reviews_count: 5
category: "Gm Genuine Parts"
url: https://www.desertcart.com.om/products/425810103-gm-genuine-parts-12135037-multi-function-diode
store_origin: OM
region: Oman
---

# Optimizes AGM battery charging Specifically designed for GM vehicles Precision-engineered fit GM Genuine Parts 12135037 Multi-Function Diode

**Brand:** gm genuine parts
**Price:** 11.94 OMR
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your GM ride with genuine precision!

## Quick Answers

- **What is this?** GM Genuine Parts 12135037 Multi-Function Diode by gm genuine parts
- **How much does it cost?** 11.94 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/425810103-gm-genuine-parts-12135037-multi-function-diode)

## Best For

- gm genuine parts enthusiasts

## Why This Product

- Trusted gm genuine parts brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted Durability:** Tested and warranted by GM for reliable, long-lasting performance.
- • **Plug & Play Precision:** Vehicle-specific fit ensures quick, hassle-free installation with minimal modifications.
- • **Seamless OEM Compatibility:** Engineered to meet GM Original Equipment standards for flawless integration.
- • **Boost Your Battery Performance:** Enhances charging efficiency, especially for AGM batteries in older models.
- • **Upgrade Your Ride’s Electrical System:** A subtle mod that transforms your alternator’s efficiency and keeps your vehicle running smoother.

## Overview

The GM Genuine Parts 12135037 Multi-Function Diode is a compact, precision-engineered component designed exclusively for GM vehicles. It optimizes alternator performance and battery charging, especially for AGM batteries in older models, ensuring reliable electrical system efficiency. Tested and warranted by GM, this diode guarantees OEM-level quality and a perfect fit for seamless installation.

## Description

Maintain your Chevrolet, Buick, GMC, or Cadillac vehicle with a Genuine GM Parts Multi Purpose Inline Diode. Only Genuine GM Parts are tested to meet GM Original Equipment standards and are designed specifically to fit your vehicle. WARNING: Cancer and Reproductive Harm

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

## Features

- Designed, engineered, tested, and warranted for GM vehicles.Fit Type: Vehicle Specific
- Precise fit for ease of installation
- For proper installation, locate your nearest GM dealer, independent service center, or body shop

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08WHLPQR3 |
| Best Sellers Rank | #76,849 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Alternator & Generator Diodes |
| Brand | GM GENUINE PARTS |
| Customer Reviews | 4.7 4.7 out of 5 stars (308) |
| Date First Available | 28 November 2021 |
| 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 |

## Images

![GM Genuine Parts 12135037 Multi-Function Diode - Image 1](https://m.media-amazon.com/images/I/41SeXKpp+iL.jpg)

## Questions & Answers

**Q: When do spark plug wires need to be replaced?**
A: 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.

**Q: What are signs spark plug wires should be replaced?**
A: 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.

**Q: Are all spark plug wires the same?**
A: 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.

**Q: Do battery cables need to be replaced often?**
A: 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.

**Q: What are signs of the battery cables need to be replaced?**
A: 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by B***N on 16 November 2025*

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

### ⭐⭐⭐⭐⭐ Review
*by M***. on 30 June 2024*

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.

### ⭐⭐⭐⭐⭐ Review
*by G***N on 28 August 2025*

Works well for the gen4 4Runner “smart”alternator to charge my AGM.

## Frequently Bought Together

- GM Genuine Parts 12135037 Multi-Function Diode
- VANTRONIK Waterproof Inline Fuse Holder 10 Pack for Mini ATM Blade Fuse,16 Gauge AWG Wire,12 Inches Long
- MUYI 6 Pack Inline Fuse Holder - 14AWG Gauge Wire Pigtail Mini Blade Fuse Holder with 15A Mini Blade Fuses ATM

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-03-17*