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Old 03-12-2020, 04:22 PM   #1
Ehodg66
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Door lock relay location

I bought my truck with the power door locks not working (not a deal breaker) and just now getting into the repair.

I've read that the door lock relay is located above the brake pedal. Does that mean mounted on the firewall? I found these 2 plugs and they look like the connectors for the relay that I've seen on the forum, but no relay.

I have a/c duct under the dash, is the relay behind the duct work? mounted to the backside of the dash?

I've also attached a pic of my fuse panel that shows a black relay at the top of the panel. Can someone identify that relay for me also?

thank you
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Old 03-12-2020, 11:04 PM   #2
1774btcrew
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Re: Door lock relay location

It should be attached to the right side of your pedal assembly
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1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog"
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Old 03-13-2020, 12:20 PM   #3
Ehodg66
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Re: Door lock relay location

Just looked again and that relay is definitely not there. Minor detail..lol

Thanks 1774btcrew
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Old 03-17-2020, 09:18 PM   #4
Pontiac1976
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Re: Door lock relay location

https://www.ebay.ca/itm/1980-81-Cadi...5/222585272770

This should look like this for the relay
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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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Old 03-17-2020, 10:48 PM   #5
Big Moose
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Re: Door lock relay location

Check behind the driver door panel, that's where I found mine
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Old 03-20-2020, 09:11 AM   #6
Sabaka454
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Re: Door lock relay location

#2
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Old 03-20-2020, 09:29 AM   #7
Ehodg66
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Re: Door lock relay location

Thanks Sabaka454,
Mine is definitely not there. PO maybe didn't want to spend the money to replace it.
Do you know what the relay(?) is on top of the fuse block? Also, is that a disconnected seatbelt buzzer next to it?

thank you
Eric
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Old 03-20-2020, 10:50 AM   #8
Pontiac1976
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Re: Door lock relay location

The one with the like grill on it is the seat buzzer, the one on the left think it your horn relay.
You make a short wiring harness to adapter to aftermarket Relays.
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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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