--- product_id: 431282610 title: "GM Genuine Parts 12135037 Multi-Function Diode" brand: "gm genuine parts" price: "€ 15.72" currency: EUR in_stock: true reviews_count: 13 category: "Gm Genuine Parts" url: https://www.desertcart.it/products/431282610-gm-genuine-parts-12135037-multi-function-diode store_origin: IT region: Italy --- # Enhances charging efficiency Precision vehicle-specific fit Tested to GM OE standards GM Genuine Parts 12135037 Multi-Function Diode **Brand:** gm genuine parts **Price:** € 15.72 **Availability:** ✅ In Stock ## Summary > ⚡ Charge smarter, drive stronger — the GM diode that powers your ride like a pro! ## Quick Answers - **What is this?** GM Genuine Parts 12135037 Multi-Function Diode by gm genuine parts - **How much does it cost?** € 15.72 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/431282610-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 - • **Plug-and-Play Upgrade:** Minor modifications only—easy to install and instantly boosts your vehicle’s electrical system - • **Top-Rated Performance:** Join thousands of satisfied drivers enjoying a 4.7-star rated upgrade for their GM vehicles - • **Optimized Charging Power:** Unlock your AGM battery’s full potential with improved alternator performance ⚡ - • **Reliability You Can Trust:** Backed by GM’s rigorous testing and warranty for long-lasting durability 🛡️ - • **Tailored for Your GM Ride:** Engineered for a seamless, hassle-free installation with exact vehicle compatibility 🔧 ## Overview The GM Genuine Parts 12135037 Multi-Function Diode is a precision-engineered inline diode designed specifically for GM vehicles. It enhances charging system performance, especially with AGM batteries, ensuring optimal battery charge and electrical efficiency. Tested to meet GM Original Equipment standards, it offers a reliable, vehicle-specific fit that’s easy to install with minor adjustments. Highly rated by users, this diode is a trusted upgrade for maintaining and improving your Chevrolet, Buick, GMC, or Cadillac’s electrical system. ## 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: diode - worked good. Review: 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. ## 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 | #81,510 in Automotive ( See Top 100 in Automotive ) #2 in Automotive Replacement Alternator Diodes | | Brand | GM GENUINE PARTS | | Customer Reviews | 4.6 4.6 out of 5 stars (325) | | Date First Available | February 12, 2021 | | Exterior | Machined | | Item Weight | 0.352 ounces | | Item model number | 12135037 | | Manufacturer | GM Genuine Parts | | Manufacturer Part Number | 12135037 | | Model | GM Original Equipment | | Product Dimensions | 1.3 x 1.1 x 0.3 inches | ## 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 ### ⭐⭐⭐⭐⭐ diode *by M***R on April 16, 2026* worked good. ### ⭐⭐⭐⭐⭐ Performs as intended *by M***. on June 30, 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. ### ⭐⭐⭐⭐⭐ Voltage increase for 4Runner *by A***H on July 3, 2025* I bought this as a cheap upgrade, that I read about online, for my 2004 Toyota 4runner’s alternator output. Now, when I’m driving, my alternator puts out 14.5-14.6 V and keeps the battery fully charged. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.it/products/431282610-gm-genuine-parts-12135037-multi-function-diode](https://www.desertcart.it/products/431282610-gm-genuine-parts-12135037-multi-function-diode) --- *Product available on Desertcart Italy* *Store origin: IT* *Last updated: 2026-05-12*