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Q:

passenger window motor on 1993 GMC Safari

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i have my window motor and when connected to a battery straight it goes up and down but when i cannect it to the plug it only goes up i have replace the switch what would be my next thing to do it is very hot and clamy in florida and this is aggravting my husband
(1) Answer
more than likely it is a wire issue, you need to trace out the wires and you will probably find a broken wire.

Roy