the fans draw a lot of current and I think the alternator isn't up to the task of recharging the battery. My generator light comes on at low rpms and goes out when I blip the throttle. I w at the goodguys show and I I started up the p car to throw a couple of revs for onlookers. When it was time to leave I didnt have enough juice to start the car. The fans are wired to come on when I turn the ignition key.