02 Montana electircal issues

[02Montana]

Hi There

I have a Pontiac Montana actually it belongs to my dad, but I'm helping him try and fix some electrical issues.

1st problem is the rear wiper motor. I ordered a new one from Rock Auto because the old one stopped dead completely. I changed the motor and it works intermittently. Some times at full speed, other times not at all.

2nd problem is the fuel gauge. Its never consistent, sometimes dropping from full to empty. I suspect the fuel sender unit in the tank which i can't change.

3rd problem is the lock switch on the passenger side doesn't work. The drivers side lock unlocks the passenger side door without issue and the drivers side door is fine. I suspect the switch is faulty, but I'm not sure.

I've gone through under the passenger side carpet and looked at the splices I can find and soldered them together, it didn't change much other than fix slow running windows.

Last but not least does anyone know a decent site to look at or purchase a wiring diagram?

 

[melsg5]

1. Try applying power directly to the motor to determine if yoy got a bad one.
2. The fuel sender is a good guess.
3. Coud be the switch or a break in the wire harness where it goes from the door to the fram through the plastic conduit.
4. Try either a Hanines manual or Autozone after your register.