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Re: Mystery wire on 66 C10 with delux heater and AC
It sounds like the previous owner picked up the "accessory" key position off of the back of the key as he was unable to find an accessory terminal at the fuse box. Unless there is something wrong with the fan motor, I do not see why you would need a resistor inline with the heater.
If you want the fan to only work when the key is on, find an "accessory" hot that will show 12v when the key is on at the fuse box. The heater fuse terminal should work. (Use a circuit tester to make sure) I would not recommend running it on a constant 12v hot.
Also, I'm not sure how much amperage that fan motor will draw, you may want to put about a 5 amp to 10 amp fuse should there be a problem with the fan motor itself. No more than 10 amps.
Tom
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