If there was a fuseable link on that wire it must have burned off, or been cut off. That wiring harness was butchered when I came across the car. The cooling fans wires were the ones mostly spliced and cut into, I havemade a whole lot of solder and heat shrink tubing repairs. The only fuseable links I can find are to the starter, and the one on the power wire for the ac/heater blower motor. I was thinking of ohm'ing the wire in question to both of the cooling fan relays, and the connections to the ecm. The only problem I have with that is I don't know which prong on the ecm wiring connector that has anything to do with the fans. My chiltons only shows a letter then a number at the connector, ( like A1-A12, B1-12,and C1-C16,D1-D16), that is all there is th go by. If I had a copy of those like at the dealership I might be getting somewhere, I dont think that they would like to let me borrow their books to go get them coppied.

 

I am new to this forum, but I have some experience with the fan switch on my 91 RS. The wire for the fan switch on my car comes out of the harness in front of the starter. The way the fan switch works, is when the temp reaches a certain point, the switch closes and supplies ground to the fan to complete the circuit. A quich and dirty way to test the wire in question is to first measure it and make sure it is not a hot wire. If there is no voltage present with the engine running, simply touch it to the chassis and see if the fan turns on. If it does, you have found the correct wire for the fan switch. If not, keep looking. It's very important that you first check for voltage on the wire. You don't want to burn something out.

 

well I figured it out. It was two wires melted apart, one of them was on a wire that looks like a fuseable link type of wire, and the other was the mystery wire I was talking about. Once I repaired the fan switch wire, ( which isn't red or brown afterall), it would make the relays click but the fans would not work. So I traced the power wire all the way back to the battery and pulled the connector apart on it and the connector was melted. Well after fixing that everything works just fine, thanks for the suggestions everyone, I wouldn't have figured it out without your help.

 

Glad you figured it out. Wiring problems can be real tough to track down, and sometimes it's easier to run new wire for something like that and just connect it directly. Pat yourself on the back for having the patience to work it out.