

⚡ Power up your ride with GM Genuine precision!
The GM Genuine Parts 12135037 Multi-Function Diode is a compact, vehicle-specific inline diode engineered to optimize electrical flow and charging system performance in GM vehicles. Tested to meet strict GM Original Equipment standards and backed by a warranty, it ensures a precise fit and reliable operation, making it an essential upgrade for maintaining or enhancing your Chevrolet, Buick, GMC, or Cadillac’s electrical system.








| 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 |
B**N
Functional diode
Works as intended. Bought this for the alternator I installed in the tractor.
M**R
diode
worked good.
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.
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
A**H
Voltage increase for 4Runner
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.
Trustpilot
1 week ago
2 weeks ago