Need help identifying wiring connectors

Rodknok

Greasemonkey
Jun 14, 2022
142
63
I'm in the middle of doing a LS swap in a 1984 grand national. I have some plugs under the dash that I don't know where they go to. Any help is greatly appreciated. I know that none of the lights work and nor do the power locks.
20221026_165124.jpg
 

ELCAM

G-Body Guru
Jun 19, 2021
804
93
Off the top of my head.

Yellow arrow = Turn signal switch.
Red arrow = goes to computer harness.
Blue arrow = One of two connectors that go to the ignition switch.
Black arrow might be for the cruise control speed sensor.





dash wiring 84GN.jpg
 
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ELCAM

G-Body Guru
Jun 19, 2021
804
93
Yellow arrow is likely the headlight on warning buzzer if you have the RPO TR9. Red arrow likely goes to the harness that goes to the tail lights and fuel gauge sending unit.


84 GN wiring 22.jpg
 
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ELCAM

G-Body Guru
Jun 19, 2021
804
93
Not on any wiring diagram I have. Leads me to believe it might be an add on harness.

Thinking now it might be for the speakers, the dark blue is a rear speaker wire color.

Does your car have one of the optional four or six speaker setups?
 

pagrunt

Geezer
Sep 14, 2014
8,216
113
Elderton, Pa
Did the car have cruise control? It might of been part of that since it looks like the later set up plug.
 
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ELCAM

G-Body Guru
Jun 19, 2021
804
93
Gm has circuit numbers and colors for specific things. For instance there is a dark blue in lighting, one in the HVAC, one for the engine, one in speakers, one in rear power vent windows etc.

You might see if you see something in these circuit ID lists.
CIRCUIT IDENTIFICATION5.jpg


CIRCUIT IDENTIFICATION2.jpg


CIRCUIT IDENTIFICATION3.jpg


CIRCUIT IDENTIFICATION4.jpg
 
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