I just acquired an 84 that runs good for 300 bucks. It does have a few issues. the main one is the radiator fan not working. someone ran a wire direct to battery and had it on a toggle switch. I would rather put it back to original. I took off resistor at fan and it is shorted. I tested the wires coming to the relay and no voltage on any with key off. Fuse looks good but my meter has become unreliable in the ohm/fuse features. That is as far as I have gotten. I think there is supposed to be hot on that relay, if so could someone please point me to the next area to check? thanks
I do not know. I am gonna have to explore and test it all i suppose. The fan does work hooked direct, and the resistor is bad. That is what I know for sure. I hope the po just didn't take the time to check everything. The resistor is bypassed in the hi mode if I am seeing this wiring correctly. Guess I need to back track from there.
resistor tested bad so i went to parts store. They found one they said would work. i took it home and tested it with meter. 1.5 ohms. thats a little high isn't it? I do not know if i should try it or not. any advice? thanks.
I tried something today. I saw in a post that I could use a green wire with white stripe behind the accelerator for keyed power to the fan. I checked it with a meter and it had 12 volts with key on. I spliced in the hot wire to the fan and nothing happened. Now there is no voltage on the wire. I took fan wire off and the voltage is still gone. fuses check good. Could someone tell me what that wire is for? I am not sure what I have messed up. Hope not too bad. thanks.
I may have to go by what you posted. The po had it direct from the battery on a toggle switch. I want it to be automatic. I know the resistor is bad and hard to find. I thought I would try wiring to key power for now. the green wire I tried has a white stripe and I know it had 12 volts before I messed with it. I do have electrical experience but do not have any wiring diagrams to go by. the green and white wire comes from under the dash and through the firewall at a connector behind the gas pedal. I can't get 12 volts on it now so I fear I have done some damage. If someone has any info on this wire I would appreciate it.
When I got my 84 the resistor was bad also, I bypassed it and found the fan would not run when the coolant temp got high enough that it should run, I also had no reading on the temp gauge.
What I found after quite a bit of digging was the previous owner had replaced the temp sender on the engine that feeds the temp gauge and turns on the radiator fan with a new one.
I found out that if you order that part from GM and they do a computer look-up it gives a number for a Fan Switch which is incorrect, the incorrect sender had benn installed in my car by the previous owner.
When I figured out that issue and installed the correst sender everything worked great.
yeah the temp gauge works. I went through the same as you with my 85 fiero. I haven't had time to mess with the car today. I am baffled as to what I could have done to lose the 12 volts on that wire. I am gonna recheck the fuses tomorrow.