You'll have to excuse my limited Paint skills, but this is a diagram of how I have these fans wired up:



Brown wire off the fan to relay power, black to ground. I now know that these have to be reversed.

Other relay red, with an inline 20A fuse, to battery positive.

Gray off relay to switch.

Black off switch to ground.


The switch is working fine, the LED goes on and off when I toggle the switch back and forth.

So if I switch the brown and black wires coming off the fan, they should turn on, even without the engine running or key turned on? Or does the engine have to be running because of the initial load when the fans start up?