79 Chevy suburban I'm going to buy a new tail gate from junk yard how do I hook a battery up to it to see?

Question:
if the window motor works there a orange blue and brown wire

Answers:

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Remember, the body of the vehicle is negative. So, any wire from the motr or switch will be positive. One wire will be bor window up, the other for window down.
Simply hook up one wire at a time to the battery, then connect the negative terminal to the tailgate, (preferrably to a place where bare metal is accessible). The window motor will run and move the window regulator up/down the track.
Best to remove the window for this test, unless you are just going to move it very little(just enough to check the workings of the motor) If you run the window up enough and it is not secured in the frame and tailgate, it could shatter with it's own weight. Happened to me while working on a '79 Bronco.
Expensive lesson to learn.

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