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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: MuddiGGEr25 on November 03, 2016, 11:36:58 pm

Title: 1988 K20 suburban back window wont go back up using any switches
Post by: MuddiGGEr25 on November 03, 2016, 11:36:58 pm

My nephew got the right rear side window to roll down while trick or treating and it wont go back up no matter what i do, and its going to be dropping below freezing agian soon.


I can only control the two drivers windows from the drivers door control.

Does anyone know which wires i can just connect 12V+ and ground to, and be able to manually send the motor and window up? I have a extra set of mini jumper cables and a spare truck battery to use so i can completely bypass the suburban wiring.

I already have the 5 wire connector hanging out

Title: Re: 1988 K20 suburban back window wont go back up using any switches
Post by: Irish_Alley on November 04, 2016, 07:14:43 am

get a helper and see if youre getting any power to the switch then use the drivers switch to try and move it while probing the wires for power

Title: Re: 1988 K20 suburban back window wont go back up using any switches
Post by: hatzie on November 04, 2016, 09:12:45 am

Download the 1988 wiring diagrams.  They'll show you what connections go where.