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Old 07-29-2020, 08:50 AM   #4
sick472
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Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,130
Re: Heater Wiring - Please Help!

The orange wire is the power feed for the "High" fan speed. It is connected to the plug that goes to the "Cig" spade at the fuse box. This will help you out...
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1972 C10
1976 C10 (parts truck)
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