I am leaving for a car show in a couple days and there is a parade of cars. I sometimes overhead in a parade due to a low volume of air going through my radiator. So, I picked up a quick Spal fan from Summit Racing, and a relay with pigtails. Great! I got it today and am trying to wire it up FAST for the show. I just want to wire it up to a manual toggle switch under my dash. I don't want a thermostat sensor of any kind. I just want to flip a switch and have the fan come on. I know I need to wire it through a relay but I have searched and searched and can't find a wiring diagram that is just the fan, relay, and toggle switch. They all have sensors, thermostats, over ride switches, etc. I just want a simple diagram on how to wire my fan, through the relay, to toggle switch. Before this gets into a discussion on the value of sensors etc. I don't have time to do that right now or I would. Does anyone have a rough sketch of how to wire the fan to a toggle switch using a relay? Some say use the toggle switch for the ground instead of the positive? Any help would be greatly appreciated. Thank you.
In a hurry I would put a fuse in holder near battery +. If fan draws, say, 10 amps a 20 amp fuse should be fine. Then use a 20 amp toggle switch. If you want to wire a relay, relay has basically two parts, coil & switch. So I would still want fuse protection, fuse close to battery positive, (14-12 ga.) wire to relay normally open contact...other contact to fan +. Fan -- grounded as well as one side relay coil. Other side relay coil a wire into car switch, other switch side to a power source. Sent from my SM-S320VL using Tapatalk
The spal fan if wired correctly has an option for an override switch as the a/c switch mine is wired through a toggle but controlled by a sensor that turns it on or off If you try to start the car with the fan running the override will allow you to turn it off for full voltage to the ignition
Yes, use 12 gauge wire to the fan, 16 or 18 for the switch. No need for heavy wire all the way, and you can use a power wire inside the cab in stead of pulling off the battery for the switch side.