09-27-2004, 04:14 PM
Get a Double pole single throw relay, and a Proper in-line fuse for the fan, and a proper Single thow/pole Toggle or rocker switch.
Hook one side of the relay COIL to 12 volts power Through any 1 to 5 amp fuse , The other side of the COIL to the wire going to your Fan on/off switch.
From the On/Off switch, hook the other wire to ground. (Your Switching grounds)
The Center wiper of your Relay (Movable Contact ) Will go to your Fan Motor, the other side of the motor to ground.
The "Normally Open" Side of the contact will go to a proper size fuse, then to power..
If your Kit came with a Thermostat Sender, you can now wire that so the lead goes to the Fan switch where the relay Coil wire comes in, and it will run in "Automatic" when the switch is in the "OFF" position...from the signal from the sender. (Remember: the Control circuit (Relay switch)is switching ground, not power, so as the temp rises at the sender, more ground goes toward the switch...turning the fan on automatically.)
You can also use a lighted switch, or an indicator lamp If you wish the option, It's good to know if the Fan is actually running! Just hook it to your Movable Contact on the relay, the other side to ground.
Hope I Didn't Confuse you...
Electronic & Electrical