Originally Posted by Shel

Okay. Removed the motor, tested both new and old ones with a direct feed to the battery and they're fine.

Got a voltage tester on the terminals. -12v and +12v when the buttons are pressed.

Can't be a loose connection at the terminal otherwise it wouldn't have the up function.

Removed the harness from the plug in the door trunking and a tiny bit of corrosion.
Cleaned it out with contact cleaner and a toothbrush. Still no difference. -12v and +12v present here on the tester too.

Any ideas guys?! Driving me mad now.


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