How would I rig up a toggle switch to turn on BOTH fans, and still be able to turn off the switch and have the ECM control the fans. I've grounded the fan switch wire, but it only controls the primary fan.

 

there is another fan relay...... i would think just to hook ur switch u have into the other relay..... dont ask me where it is..... i still havent foud the one for the primary fan!!!! if anyone with a 87 camaro... please tell me where the F#ck it is.....thanks fellas peace

 

I found how to do it from another post. You just tap into the the green/wht. stripe wire going into the relays and ground it with the switch. I think I'll run one switch for each fan. Maybe even a light showing when the fan is already running. On my 88 dual fan setup the primary relay is mounted between the battery and radiator, the secondary relay is mounted on the inner fender on the other side of the battery.

 

brian u have no idea how happy i am that u told me where u relay is.... i have been asking for about a year now..... no answer.... ahh now i have to go to work and pick up a lighted switch.. what gage wire did u use for ur primary fan switch... and that secondary relay only has 2 wires... i see one orange/blk stripe and a black wire.. which one to tie into.... thanks

 

That second relay with two wires is not for your fans. Both relays should be identical. The secondary fan relay should be next to that one.(Mine is) If not it could be on the firewal next to the power brake booster. Then I wouldn't be sure which one it is because there are multiple relays that look similar there. Check for the green/wht. stripe wire.

here's where I got the diagram:

https://www.thirdgen.org/techbb2/sho...hreadid=115154

 

yea i looked at my power boster..... there are 3... and i just kinda gave up on that second one.... it runs pretty cool ever since i put a new (old) radiator in there.... never really gets above 220 i think that between the 180 stat and primary fan switch... i should be good just wana know what kind of wire to run?

 

The 3 relays by the booster on mine, are 2 fan relays and the fuel pump relay (91 Z).

Jim Buckingham

 

On the 87 the relays would be: fan, fuel pump and MAF burnoff.(not in that specific order) I ran 16g wire. 14g would probably be better. just make sure that the wire you run isn't smaller than the wire you tap into.

 

yea i see them... the one says maf power.... i dunno about the other 2.... which is fuel or fan... anyway... 14g? ok ima get that next time i go into work.... that and a red light up toggle switch... thanks buddy peace