Door locks help 81/87 c10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tony71c10 · 01-19-2021, 12:27 PM

I did some research on the door locks but I'm still confused. I have 3 wires on my door lock harness with a relay attached to the bracket on the pedal. I read that there is a wire or 2 that goes to the fuse box. I didn't see that wire on my 3 wire harness. How does the lock switch get it 12v. I'm a little confused. On a good note my windows work great with the relay mod. Any info is well appreciated

Tony71c10 · 01-19-2021, 07:32 PM

So I went back and found the orange wire that connects to the fusebox. Hooked it up and tested for current at both switches and at the relay. I have power to them. Thinking it might be the relay that has gone bad

Pontiac1976 · 01-21-2021, 01:11 AM

Try this test the relay should help you out.> https://www.youtube.com/watch?v=IpRWcNoLdwQ

Tony71c10 · 01-23-2021, 04:35 PM

Quote:

Originally Posted by Pontiac1976

Try this test the relay should help you out.> https://www.youtube.com/watch?v=IpRWcNoLdwQ

These relays are hard to find. I wonder if I can put a 5 pin Bosch relay instead. If anyone has done this can you post what wires goes to each pin. Thanks in advance.

**Wgesnerjr** · 01-24-2021, 07:29 AM

The relay most be mounted to work. That's how it gets a ground, through the metal case. If mounted and no ground, clean mounting area.

Pontiac1976 · 01-25-2021, 07:42 PM

If your using the factory relay if you do as Wgesnerjr said. Turns out to be no good or it does not work. Then you can use this link post near the bottom relay https://bowtieguy.proboards.com/thre...lliamps-charts

01-19-2021, 12:27 PM	#1
Tony71c10 Registered User Join Date: Feb 2017 Location: Houston tx Posts: 117	Door locks help 81/87 c10 I did some research on the door locks but I'm still confused. I have 3 wires on my door lock harness with a relay attached to the bracket on the pedal. I read that there is a wire or 2 that goes to the fuse box. I didn't see that wire on my 3 wire harness. How does the lock switch get it 12v. I'm a little confused. On a good note my windows work great with the relay mod. Any info is well appreciated

01-19-2021, 07:32 PM	#2
Tony71c10 Registered User Join Date: Feb 2017 Location: Houston tx Posts: 117	Re: Door locks help 81/87 c10 So I went back and found the orange wire that connects to the fusebox. Hooked it up and tested for current at both switches and at the relay. I have power to them. Thinking it might be the relay that has gone bad

01-21-2021, 01:11 AM	#3
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	Re: Door locks help 81/87 c10 Try this test the relay should help you out.> https://www.youtube.com/watch?v=IpRWcNoLdwQ __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

01-24-2021, 07:29 AM	#5
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Door locks help 81/87 c10 The relay most be mounted to work. That's how it gets a ground, through the metal case. If mounted and no ground, clean mounting area. __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project

01-25-2021, 07:42 PM	#6
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	Re: Door locks help 81/87 c10 If your using the factory relay if you do as Wgesnerjr said. Turns out to be no good or it does not work. Then you can use this link post near the bottom relay https://bowtieguy.proboards.com/thre...lliamps-charts __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.



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