Re: 1983 c20 blower only works on high
Don't know; the circuit diagram doesn't say. You have to follow the orange wire through the wiring harness from behind the switch. It's heading for the blower motor and the resistor. At some point, there is a splice, with the wire splitting up between the switch and the blower motor. My bet is that the orange wire from the switch has corroded and broken off the splice.
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Rich Weyand
1978 K10 RCSB DD.
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