The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Can somebody please tell me where all the extra wires go on the power window switches

RustyPile · 02-24-2022, 02:34 PM

Probably because nobody has memorized the circuit.. Go to the top of this ELECTRICAL forum and download the '78 wiring diagram. Check and compare the wiring diagram that comes with the painless harness. Follow the diagram pathways for the various color coded wires. The power window circuitry is very complex and not for the faint headed or inexperienced. Work slowly and carefully. Get some hands-on help if you get stumped. Do not get antsy if a motor doesn't work. Although bad or missing grounds are often accused in some cases, DO NOT add grounds to the switches or motors. They are "special" and do not require external grounds. The switch reverses the polarity of the wires feeding the motor to reverse its direction of rotation.

02-24-2022, 02:34 PM	#3
RustyPile Registered User Join Date: Dec 2017 Location: Elkhart, Texas Posts: 1,550	Re: Can somebody please tell me where all the extra wires go on the power window swit Probably because nobody has memorized the circuit.. Go to the top of this ELECTRICAL forum and download the '78 wiring diagram. Check and compare the wiring diagram that comes with the painless harness. Follow the diagram pathways for the various color coded wires. The power window circuitry is very complex and not for the faint headed or inexperienced. Work slowly and carefully. Get some hands-on help if you get stumped. Do not get antsy if a motor doesn't work. Although bad or missing grounds are often accused in some cases, DO NOT add grounds to the switches or motors. They are "special" and do not require external grounds. The switch reverses the polarity of the wires feeding the motor to reverse its direction of rotation.