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Old November 8th, 2023, 01:08 PM
James James is offline
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Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 69
Posts: 432
Rep Power: 200
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Default Re: 66 GMC Heater control/switch not working

Quote:
Originally Posted by esquibdl View Post
All of my lighting problems were grounds.

Is there a pinout for the heater slider switch? Is there an actual ground wire. Or does the metal fan housing (if properly grounded) serve as the ground connection?
I do not have the wiring manual for your truck so I would not know. On my 64 it is grounded to the body of the motor. If your is the same then the motor to the blower housing and to the cab should have a good ground.
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