mattRS

gotta 305 TBI. wondering where i hook up the wires for a manual fan switch. is it at the wire that plugs into the fan? electric fan, if that helps any.

No4NJunk

There should be 2 wires coming from the fan motor. one is a ground wire and one is the power wire. The ground wire will probably be black and the other one red (maybe). You'll have to find out. Wire The switch into this wire and run it back to the battery. And of course ground the other wire to something metal (frame, or block).

cam92rs

this is enough to make me angry,im goin to do this,and i only plan on doin this right,and i only plan on doin this once.....you say the fan(single) has 2 wires,a positive and a negative,now for full manual control,couldnt you just cut the wires,add wires(to both the positive and negative) and run them to a switch?? if the + wire is connected to the switch,along with the - on the switch(not together,but on the same switch,just to clarify) will this give you full manual operation?it makes no since to me because what would be powering the fan?now,if i were to cut into the constant power supply,and run just that 1 wire to a switch,and ground the switch to oo lets say the support behind the cd player.willl that give me full manual control??im about to go out and cut into her right now,and tell you guys how i did it! some info is greatly appreciated

Anthony

Evil86Saleen

I just did this to my 91 RS.

Two pugs on the fan, one hot one ground. Used female conecters to attach my new wires to the fan. Ran the ground (IIRC wire on driver side of fan) to the factory ground on the passenger side fender area. Ran power from fan into 50 amp toggle switch that i mounted in the little plastic cover on the keft hand side of the dash below the head light switch. Used a hole saw to make a hole for the switch. Run the other power wire off of switch to the little power point (hot wires next to the battery at the little junction) with a 30 amp inline fuse.

Works great and my coolant temps never reach 220.

I'm not sure how many amps the fan draws but get a good quality toggle switch that can take it. Otherwise you may end up with a melted swith and a fire.

kyle

91 camaro racer

iTrader: (2)

another option (the way i did it) is instead of taking your wire all the way up front to the actual fan, is to take it to the relay located drivers side on the firewall near the brake booster. it is the relay nearest the fender. route a wire to the green/whit wire( that is the ground for the relay) and ground the other side. works the same as other option, just a little less wiring that you have to worry about.

Damon

What 91 camaro racer said. Definitely the easiest way to do it. The factory relay is activated when the temp switch in the pass. side cylinder head hits a certain temp (around 220* for that motor) and grounds a single wire that goes to the '-' side of the relay. All you need to do is supply ground to that same wire and it'll turn on the fan exactly like the factory temp. switch does. And this is a low-amp connection- just enough to activate the relay, not on the high-amp side of things that actually powers the fan motor. Very simple one-wire hookup.

Zepher

iTrader: (1)

Fix the problem and be done with it.