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Thread: Dual Electric Fans

  1. #1
    Join Date
    Jul 2014

    Dual Electric Fans

    I swapped a 2002 5.3 into my 91. I used a painless harness set up for dual fans. Each fan is wired through a relay and is fused. The fans are from a 2006 Silverado. Once the AC kicks on, a fan comes on (like it's supposed to). The voltmeter begins to drop and heads south. Once the second fan comes on, the gauge drops further settling just north of the red warning indicator on the gauge (factory needle style gauges). Battery is new Optima, alternator is new and a 270 amp unit and I have done the Big 4 upgrade with 1/0 wire. Any help is appreciated to find out how to fix the voltage drop. Stereo is approx. 50 watts no amp. Also this condition occurs whether the lights are on or not (HID conversion)
    Thank you.

  2. #2
    Join Date
    Mar 2003
    San Antonio, TX
    Possibly run a large/upgraded wire from the alternator post to the battery and then to the fuse block.

    Be sure you have a large ground from the battery, to the block and from the battery to the frame and from the battery to the front clip (radiator support/fenders)

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