put the new doors on - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hotrodhomi · 05-15-2005, 10:26 AM

I changed the doors on my ’81 and put some on from a ’90 burb. The new doors have PW and PL. The PL work get but I’m having problems with the PW. Can someone explain this? I have 12V to the common side of the switch at all times. When I press the switch up or down I have power to both sides of the switch. WTF. If I disconnect the PW motor then I have power on one contact when I press up and I have power at the other contact when I press down. This seams right. Can anyone at explain to my why I have power on both contacts when I press up or down on the switch and the motor is hooked up?

hotrodhomi · 05-15-2005, 11:41 AM

Any one know how to take the motor out of the door? I loosened the four bolts that I thought held it in but it didn't budge.

Russell · 05-15-2005, 12:24 PM

You also need to drill out a couple of rivets to remove the motor

There is an article that outlines a bunch of important steps to this on www.73-87.com

hotrodhomi · 05-15-2005, 12:32 PM

Than looks like a PITA. Anyone have any ideas on the power issue?

Bagd74Jimmy · 05-16-2005, 04:18 PM

A power window works just like a door lock acuator does. When one wire gets 12v the other needs to get ground, when this happens the window motor will move up or down, depending on configuration. I believe the common power wire going to the switch should be purple, could be wrong. If you want I can draw a diagram on how to get the windows to work with relays and 4 momentary switches and e-mail it to you.

f.monroe · 05-16-2005, 05:36 PM

Sounds like it is just missing the gorund .You have 12 volts on each terminal but what do you have when you check across the terminals . What you have now is probably just a circuit looking for a ground . The 12 v will feed through the motor all the way to where it suppose to go to ground . Frank

hotrodhomi · 05-16-2005, 06:32 PM

So do you think I should take the doors off and scuff up the hinges to ensure I have a proper ground to the body? I think I’ll try and use a jumper wire on it first.
thanks.

crawdad · 05-16-2005, 08:15 PM

hotrodhomi I hope you don't mind if I slide in a related question on your post. My electric windows work, but at a VERY slooooooooooow pace. What would cause this? Could that also be a ground problem?

hotrodhomi · 05-17-2005, 09:41 AM

I checked the ground on my window motors yesterday. It was about .1ohm so that definitely not the problem. I also unhooked the right motor and tried to get the left side to work and vise versa. still no worky. Does someone have a wiring diagram for a '91 suburban? I wonder if one of the wires I cut that went to the back doors has anything to do with it. All things point to two bad motors but that’s a lot of work to get them out. I want to be sure about it.

hotrodhomi · 05-17-2005, 09:42 AM

crawdad: a bad ground could do it. also if your track is misaligned or pinching the window.

05-15-2005, 10:26 AM	#1
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	put the new doors on I changed the doors on my ’81 and put some on from a ’90 burb. The new doors have PW and PL. The PL work get but I’m having problems with the PW. Can someone explain this? I have 12V to the common side of the switch at all times. When I press the switch up or down I have power to both sides of the switch. WTF. If I disconnect the PW motor then I have power on one contact when I press up and I have power at the other contact when I press down. This seams right. Can anyone at explain to my why I have power on both contacts when I press up or down on the switch and the motor is hooked up?

05-15-2005, 12:24 PM	#3
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	You also need to drill out a couple of rivets to remove the motor There is an article that outlines a bunch of important steps to this on www.73-87.com __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

05-16-2005, 04:18 PM	#5
Bagd74Jimmy Registered User Join Date: Apr 2005 Location: San Antonio, Texas Posts: 28	A power window works just like a door lock acuator does. When one wire gets 12v the other needs to get ground, when this happens the window motor will move up or down, depending on configuration. I believe the common power wire going to the switch should be purple, could be wrong. If you want I can draw a diagram on how to get the windows to work with relays and 4 momentary switches and e-mail it to you. __________________ 1974 GMC Jimmy ( on 'bags by the end of summer ) 1959 Chevy LWB Stepside

05-16-2005, 05:36 PM	#6
f.monroe Senior Member Join Date: May 2004 Location: Caldwell,Tx. Posts: 3,648	Sounds like it is just missing the gorund .You have 12 volts on each terminal but what do you have when you check across the terminals . What you have now is probably just a circuit looking for a ground . The 12 v will feed through the motor all the way to where it suppose to go to ground . Frank Last edited by f.monroe; 05-16-2005 at 05:38 PM.

05-16-2005, 08:15 PM	#8
crawdad Senior Member Join Date: Sep 2004 Location: Georgia Posts: 614	hotrodhomi I hope you don't mind if I slide in a related question on your post. My electric windows work, but at a VERY slooooooooooow pace. What would cause this? Could that also be a ground problem? __________________ 2012 Silverado LT 1500, 5.3, 6 speed auto '86 SWB C-10 Silverado

05-15-2005, 11:41 AM	#2
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	Any one know how to take the motor out of the door? I loosened the four bolts that I thought held it in but it didn't budge.

05-15-2005, 12:32 PM	#4
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	Than looks like a PITA. Anyone have any ideas on the power issue?

05-16-2005, 06:32 PM	#7
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	So do you think I should take the doors off and scuff up the hinges to ensure I have a proper ground to the body? I think I’ll try and use a jumper wire on it first. thanks.

05-17-2005, 09:41 AM	#9
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	I checked the ground on my window motors yesterday. It was about .1ohm so that definitely not the problem. I also unhooked the right motor and tried to get the left side to work and vise versa. still no worky. Does someone have a wiring diagram for a '91 suburban? I wonder if one of the wires I cut that went to the back doors has anything to do with it. All things point to two bad motors but that’s a lot of work to get them out. I want to be sure about it.

05-17-2005, 09:42 AM	#10
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	crawdad: a bad ground could do it. also if your track is misaligned or pinching the window.

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