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Originally Posted by Sharky
OK, I'll try that and I'll get back to you. Thanks 
BTW, is there any kind of test I could do on the relay? I have a multimeter if that helps..... |
It depends upon how may wires there are and if you can disconnect them easily. Remember that automobile electrical systems run 12v wiring that is always energized from the approprite fuse to whatever device is to be operated. The `switching' action that takes place in what you are calling your fan switch, for instance actually "Grounds" the circuit and completes it. Check voltage from ANY location to ground. There is NO `neutral' or `return' wire as you would find in your home wiring. Your three wire fan switch should have a wire that goes to a ground somewhere and two wires with a constant 12v. That means that it is possible that the wire for `high speed' is NOT energized at all, resulting in no high speed operation. The two wires with 12 volts probably connect to your `relay' somehow but what you are calling a `relay' might actually be the temperature sensor. Can you get a wiring schematic from your car dealer or is there one in in your owner's manual?
