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GM Genuine Parts 12135037 Multi-Function Diode

4.6 4.6 out of 5 stars 180 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Automotive Replacement Alternator Diode Trios by GM Parts
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Purchase options and add-ons

  • 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
› See more product details

Frequently bought together

GM Genuine Parts 12135037 Multi-Function Diode
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MCIGICM 12 AWG Inline Fuse Holder with 30A ATC/ATO Blade Fuse, 5 Pack
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From the manufacturer

More parts to explore
Wire Product Image

GM Genuine Parts and ACDelco Wires and Cables

GM Genuine Parts Original Equipment and premium ACDelco Gold (Professional) aftermarket wire and cable products include high-quality spark plug wire sets, coil on plug boots, battery cables, pigtail/trailer connectors, lamp sockets, sensors, relays, and wiring harnesses all recommended by GM.

Wiring Harness Product Image

Wiring Harness Product Image

Wiring Plug Boot Product Image

Wire Sets Product Image

Pigtail Connectors

GM Genuine Parts Pigtail Connectors are ready to be spliced into vehicle harnesses. Their color-coded wires allow for easy installation and have protective coverings to help provide lasting durability. GM Genuine Parts offers an interactive catalog to help you find the right pigtail connectors for your vehicle.

Vapor Canister Vent Solenoid Harnesses

GM Genuine Parts Vapor Canister Vent Solenoid Harnesses connect the ventcontrol valve solenoid to the vehicle’s electrical system to help the system operate properly. Durable outer coverings help protect against tough conditions and moisture. Wires are also color coded for easy installation.

Coil on Plug Boots

ACDelco Gold (Professional) Coil on Plug Boots are made of a flexible, heat-resistant outer cover over a conductive spring that delivers the spark from the coil to the spark plug.

Ignition Wire Sets

Premium aftermarket ACDelco Ignition Wire Sets are engineered with full fiberglass braid and a silicone insulation. All ACDelco Spark Plug Wire sets features a carbon latex reactive layer that acts as a second protection to stainless windings.

Maintenance Tips and FAQ

  • Before purchasing and installing a socket assembly, make sure it’s the correct size and fit for your vehicle.
  • Are all bulb sockets the same? No. Some sockets have more contacts than others, depending on their function.
  • Is there a reason there’s grease in my old socket? Yes. It’s dielectric grease, which is designed to keep water out to protect the contacts from corrosion.
  • Does the ABS wheel-speed sensor harness need to be replaced when the sensor is replaced? No. The harness only needs to be replaced if it’s worn or cracked, or if the wire insulation is damaged.
  • Is an illuminated ABS light a possible sign of a malfunctioning wire harness? Yes. Your vehicle’s ABS light may illuminate for several reasons, and one potential cause is a malfunctioning wire harness.
  • Do all vehicles have ignition coil wires? No. Whether your vehicle has an ignition coil wire depends on the type of ignition system in your vehicle.
  • Are all ignition coil wires the same? No. Ignition coil wires come in different lengths with different boots at the ends.
  • Is the vapor canister vent solenoid harness weather-resistant? Yes. The harness helps protect the wires and pin connections from the elements.
  • Can a vent solenoid stick? Yes. A vent solenoid can stick open or closed, which may cause the Check Engine light to illuminate.

Product 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

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GM Genuine Parts 12135037 Multi-Function Diode

GM Genuine Parts 12135037 Multi-Function Diode

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What's in the box

  • Multi Purpose Inline Diode

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    Price$11.24$14.85$15.93$29.69
    Delivery
    Get it as soon as Friday, May 17
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    Get it May 17 - 24
    Get it May 17 - 24
    Customer Ratings
    4.64.6 out of 5 stars180
    4.64.6 out of 5 stars291
    4.64.6 out of 5 stars166
    4.64.6 out of 5 stars291
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    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    180 global ratings
    FJ Cruiser AGM voltage booster
    5 Stars
    FJ Cruiser AGM voltage booster
    Did just what I needed it to. 13.8V increased to 14.5V to properly charge my NAPA 9834R AGM battery. Some trimming required. I used the wire wheel on a bench grinder to whittle away the excess.
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    Top reviews from the United States

    mastee
    5.0 out of 5 stars Works great charging AGM in my 4th gen 4runner
    Reviewed in the United States on March 28, 2024
    Verified Purchase
    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.
    Helpful
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    Amazon Customer
    5.0 out of 5 stars Good
    Reviewed in the United States on March 21, 2024
    Verified Purchase
    Good
    Helpful
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    Slate
    5.0 out of 5 stars Works
    Reviewed in the United States on March 12, 2024
    Verified Purchase
    Working for my application
    Helpful
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    leo wink
    5.0 out of 5 stars FJ Cruiser AGM voltage booster
    Reviewed in the United States on December 3, 2023
    Verified Purchase
    Did just what I needed it to. 13.8V increased to 14.5V to properly charge my NAPA 9834R AGM battery. Some trimming required. I used the wire wheel on a bench grinder to whittle away the excess.
    Customer image
    leo wink
    5.0 out of 5 stars FJ Cruiser AGM voltage booster
    Reviewed in the United States on December 3, 2023
    Did just what I needed it to. 13.8V increased to 14.5V to properly charge my NAPA 9834R AGM battery. Some trimming required. I used the wire wheel on a bench grinder to whittle away the excess.
    Images in this review
    Customer image
    Customer image
    One person found this helpful
    Helpful
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    Amazon Customer
    5.0 out of 5 stars Works GREAT!
    Reviewed in the United States on November 30, 2023
    Verified Purchase
    I bought this Diode for a project to increase the Voltage on my truck, it definitely worked.
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    rick f.
    4.0 out of 5 stars Great price
    Reviewed in the United States on March 2, 2024
    Verified Purchase
    Good product great price
    One person found this helpful
    Helpful
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    Clinton Walker
    5.0 out of 5 stars Perfect Part for Tundra Voltage Modification
    Reviewed in the United States on September 27, 2023
    Verified Purchase
    Use this on my Tundra and now have a consistant 14vdc coming back to my battery without any modification to the alternator.
    One person found this helpful
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    troy
    5.0 out of 5 stars .5 to .6 extra volts for the alternator to charge AGM batteries.
    Reviewed in the United States on July 14, 2023
    Verified Purchase
    96 4runner and this is .6-.7 volts over stock.
    You will probably end up adding a fuse to this later on so consider fabricating something from the start although this is a simple way to see what you think of the modification.
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