[sam-tip]

I thought I should asked before I go and design a relay system. I have the following wires for my fan. Wiring harness 152 151 157 and ground. The fan has two wires + and -. Plus I have two wires from the computer. One turns on a fan at 180 deg and the second wire will turn on a fan at 220 deg. These wires will be connected to relays. I am only using one large fan from summit racing. So I will only need to use one of the fan wires.

I would like to be able to have the computer regulate the fan plus be able to override the computer with the switch on the dash.

I was thinking of using the computer to control the fan as if it were an air conditioning switch. But which wire would that be. Or am I missing something at the end of the front main harness.

Thanks
Doug