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Official Curmudgeon
4,707 Posts
Mine is an '80 CJ, but i'm sure the wires to the heater duct are the same. There is a pair of resistors in
there for the low and medium blower speed. If you want to be sure, unplug it and you should only have
high blower speed.

I believe the big black insulators on the wires are the fuse links and these should be the main positive
elecrical feed and the return from the alternator. I can't be sure, I don't have schematics for that late a

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