Dobaroy
Well-Known Member
Wiring up an electric fan and on the relay, not sure if the ground wire should go to 85 or 86. Any help would be appreciated. Thanks
Wiring up an electric fan and on the relay, not sure if the ground wire should go to 85 or 86. Any help would be appreciated. Thanks
The control side of the relay should pull very little Amperage! The thermostat should be on the control side (where I show a switch in the drawing). You'll notice that I fused the switch power (this controls the relay) at 1 Amp. A 25 Amp stat is 25 times higher than my little 1 Amp fuse and toggle switch. I'm not sure why your stat would fail at such low current draw? If it were me, I would use a meter set to amps, and see how much draw your relay takes to pull in the internal contacts. If it's anything more than an amp I would toss it out. This should be tested with a temporary jumper wire from +12V to the T85 terminal with a meter set on AMPS in between. Make sure you have good -12V (ground) on terminal T86 as well!67 B-body, the fan we are working on runs on a 40 amp fuse and we have now tracked down a 25 amp stat with a harness on it for a 40/60 amp relay. We are thinking of getting the 40 amp relay because I don't think the relay should be higher than the fuse for the fan. If you think this will work, would you let me know. Thanks
Glad to help....Thanks for the reply 67 B, quite a bit of info to get my head around. Yes, I think you are right, we need the meter to tell us how many amps are being drawn. The alternator that is on this car now seems to have stood up to the fan for the short while that we ran it. It is a 120 amp one wire GM alternator. So I hope that part of it will stay together. Will let you know how we make out.