I have a dual fan set up from flex-a-lite. I believe my 9 year old control box is going out on me. Fans used to come on at 180 Saturday night they never came on(had a lose wire). They would run 30 seconds after you turn the car off now it seems like they run for every and you have to manual turn them off. The way its set up is power from the horn relay into a circuit breaker and then into the control box 12+, ground is at the ground screw for the head lights, key on runs to another circuit breaker so the fans run for a giving time frame.