GM Genuine Parts 12135037 Multi-Function Diode
Product ID: 431282610
⚡Enhances charging efficiency
🔧Precision vehicle-specific fit
🛡️Tested to GM OE standards
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⚡ Charge smarter, drive stronger — the GM diode that powers your ride like a pro!
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.
| 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 |
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.
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.
B**D
Read the directions
If you try to put it in upside down it sticks to your thumb then the ER doctor will laugh at you
G**N
Gets the most out of the Gen 4 4Runner alt.
Works well for the gen4 4Runner “smart”alternator to charge my AGM.
A**R
Great for the money
Work for great what I needed
M**E
Works great charging AGM in my 4th gen 4runner
I installed a Odessey Extreme AGM in my 4runner, my battery voltage monitor never showed anything above 13.8ish while driving, per the manufacturer spec sheet/forums the voltage needs to be 14.5-14.8ish to fully charge AGMs. This GM diode installed in the fuse box that is located in the engine bay has bumped the charging voltage up, and now I mostly see it at 14.5 or a little above, the battery seems to be performing better as well. I will add the original fuse inline for good measure soon.
S**Y
Longevity
2017 tundra. I installed an AGM battery and installed this in lieu of the 5 amp ALT fuse as to charge the battery at +13.5v as needed. Had it on the truck for about 8 months and the diode gave out. Voltage went back to oscillating 12.8-14 as before. Figured I’d get more longevity out of it being a genuine GM part but not the case.
B**N
Functional diode
Works as intended. Bought this for the alternator I installed in the tractor.
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
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.
J**T
Exactly as described
Fast delivery in gm packaging thank you
S**N
Bonne pièce
Pour fodge charger 2008 3.5l
Trustpilot
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