Re: Tail gate regulator spring replacement.
I converted to electric windows when I bought the car, using factory wiring and parts from a 69. Cleaning off the rust made the biggest improvement. Added a factory reversing relay commonly used for door locks that initially did not work. Turns out the three-wire motors wont tolerate having either drive terminal grounded, which the relay does by default. Two-wire motors require default grounding, and I'll swap one in to see if the motor is the problem. Used shrink tube inside the relay to prevent grounding. Diodes on the drive wires would work too. Had the ground problem, tossed the safety switch, and I will also run a ground wire through the loom into the cab. I have never been able to wind any window spring by hand, so I think it's ready to break. The Blazer spring I bought wants a thinner capstan, so it won't fit the wagon. Yet. Friday I will look at the Impala's regulator to see if they match, got a line on one of those. I used the factory wiring to trigger the relay, and new wires from the relay to the motor, and spliced the hot wire to the relay hot, so no real current flows through either switch. Works, but too slow rising and too fast dropping.