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I'm new on this forum. I tried researching this all over on Google and could not find anything so I decided to register and join this forum to ask you guys about this... I bought a 1999 Chevy Blazer and the previous owner replaced the passenger door, The four windows does work but not the power locks anywhere even the hatch lock in the vehicle, I can't open the hatch manually either! So I decided to look at that door the previous owner replaced and I found out the previous owner CUT the wires inside the flex duct between coming from the dash to the window wires!!!...
How do I replace the wires under the dash for that window wiring harness? I tried to open the glove box to find where the wires is coming from the flex duct to the passenger window but no luck.
Replacing those wires would be tough. Your only option would be to go to a wrecking yard to find them. That would assume that you can find plugs and connectors that would allow you to only have to deal with a smaller wiring harness.
I had a similar problem but on a much smaller scale.
I thought the electronic part of my driver's side door lock mechanism had gone bad. I went so far to replace it. Doing that was an annoying job that didn't fix the problem. To shorten the story, I did a lot of tracing of the problem, thought I found issues with the wiring elsewhere only to find that a previous owner had once cut into one of the wires in the bundle and had nicked the insulation on some of the other wires. It was one of these wires that slowly broke.
Once I did a proper repair with solder and heat-shrink tubing, it worked fine.
I fear that the best way to repair this will be to solder them all. Make sure you do a good job, these wires in that joint, even though in the bellows, can be exposed to moisture and of course bending. You might be able to put some slack into the harness by disconnecting the harness from inside the door.