H104 Indicator light harness for 1996-2004 GM Truck (oval)


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This adapter harness is supplied with all MechMan hairpin alternators for 1996-2004 GM Trucks and SUV's. It accepts oval GM alternator plugs and then plugs into your vehicles harness.

The longer yellow wire gets connected to an ignition switched 12V+ source to turn the alternator on and off with the key, and also prevents the "check battery" light from coming on in the dash. This harness can also be modified and hardwired to ignition 12V+ for engine swap applications where the stock alternator harness is not available. This harness is included with all Mechman alternators that need this to function properly right out of the box. Not using this harness in the 6 phase style alternators we offer will generally create a low RPM no charge/battery light. If we include the harness, then you need the harness!

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  • 5
    Alternator harness

    Walter | 21st Mar 2024

    It works as it should and they got it to me fast

  • 5
    Works as described.

    Matt | 29th Aug 2023

    Simple installation process to upgrade my standard alternator to 400amp