Need help identifying the interior wiring harness plug-ins

[joshloaf]

Note: This is my first OBS and the first Chevy I’ve ever restored at this level so please have some patience, lmao.

Long story short, I need to identify the plug-ins under the dashboard before I clean and install the interior. I’ve got everything inside the cab gutted except for the steering column and the wiring (duh). I need to know what everything plugs into so when I put the whole dashboard, HVAC, etc into the cab, I’m not throwing tools trying to find the plug-in locations. TIA! I’ll attach some pictures with according numbers.

 

[PlayingWithTBI]

Maybe if you include year, engine, trans, trim package, electric windows/doors, a/c, etc?

 

[AK49BWL]

4 and 1 belong together, that's your HVAC Power supply. 7, 8, 9 are your HVAC door actuator connectors, I'd have to consult my diagrams to remember which one goes to which motor.. 5 and 6 are your Blower connectors, black ground, purple hot. 11 is your floor dome light, 1156 bulb needed. Not sure about 10.... 2 is your engine to body harness, usually the other end would be close to the ECM and is two separate black connectors held together.

 

[joshloaf]

Maybe if you include year, engine, trans, trim package, electric windows/doors, a/c, etc?

Absolutely. I included the year, body and body style in the tags which is a 1989 Single Cab Stepside; as per the rest it’s the 350 TBI, Silverado, electric windows, 4X4, A/C, and tow package.

 

[joshloaf]

4 and 1 belong together, that's your HVAC Power supply. 7, 8, 9 are your HVAC door actuator connectors, I'd have to consult my diagrams to remember which one goes to which motor.. 5 and 6 are your Blower connectors, black ground, purple hot. 11 is your floor dome light, 1156 bulb needed. Not sure about 10.... 2 is your engine to body harness, usually the other end would be close to the ECM and is two separate black connectors held together.

That’s such a big help, thank you. Any chance I could reference the diagram(s) you’re talking about?

 

[GoToGuy]

If your stuck or not sure, the service manual does he have drawings of every connector, wire colors to same, and function. The electrical section . Personally I gotta tag everything, or get interrupted then this happens, " now where does that connector go?" Good luck.

 

[AK49BWL]

That’s such a big help, thank you. Any chance I could reference the diagram(s) you’re talking about?

This one's for a 90 but is the same as your 89: https://www.ak49bwl.com/other/wires/1990_Silverado_HVAC.pdf

So based on that, 7 is for your recirc door motor (back against the firewall behind the blower motor), 8 is for your Temp door motor (front of HVAC box, behind factory cassette location), and 9 is for your mode doors motor (left side of HVAC box).