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If there is a mechanical bind in the system (be it in the regulator, or in the motor, itself), you should see/hear something (click, jerk, or dimming of the ligthts). If there aren't any signs, this is likely elecrical in nature.
But if it is intermettent, this might be more difficult to isolate. I would start by checking voltage at the motor.
Phew, simple fix! Turned out the wiring harness had come unplugged ….:_thinking how the h3!! did that happen?
I clicked it back in then tried to remove it … it's really hard to push that release button.
So I'm thinking I must not have engaged it completely when I installed my new bezel about 4 months ago and it just got vibrated out.
Thanks all! :thumbup: