Bench test 8 pin window motor?

Tiny
INTEGRALAUTO
  • MEMBER
  • 2005 LINCOLN NAVIGATOR
  • V8
  • 4WD
  • AUTOMATIC
  • 65,000 MILES
I have replaced the window motor, and it would not turn the gear. I can hear the motor trying to run, but it doesn't move the gear. I swapped it out, luckily the warranty let me swap it for another motor. The second motor did the same thing. I have swapped it again for a third motor. I suspect that it may not have been a faulty motor as it is not really likely to have received two faulty motors back-to-back from the parts store. Before I install the third motor, I wish to bench test it. I know that a two-wire motor is a simple positive to negative situation. The motor I am swapping is for the driver's side door and has an eight-wire setup for auto up, auto down, etc. My question is, do I need to do anything additional to test the 8-wire motor, such as provide extra grounds on all ground wires or put a voltage to an additional wire to get the motor to move? Or do I just need to supply a voltage and ground across the pins for the motor itself?
Friday, December 22nd, 2023 AT 9:58 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,458 POSTS
It sounds like you have a bad ground, how did the old window motor fail? I just want to know if it was doing the same thing as the replacement. How to a guide to on how to test the grounds and the window wiring diagrams so you can see how the system works.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

There is a logic module inside the window motor FYI, you might need to get an OEM unit. Also, check the window tracks so make sure the window itself can be moved easily. Check out the images (below). Let us know how it goes.
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Friday, December 22nd, 2023 AT 1:00 PM

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