Question about 1992 Ford Bronco
Have a 1992 Ford Bronco Eddie Bauer edition. The Tailgate power window will only run in one direction when connected to the vehicle wire harness, but it works fine both directions when i direct wire it to the battery, reversing the wires changes the direction.
I have tested bothe the switch on the dash and the key switch on the tailgate and get 12VDC to BOTH Motor leads when I actuate the switches in either direction, but the motor does not turn. is there a relay somewhere in this system that i need to be looking for? Could use a wiring schematic but don't want to pay for one for just one electrical problem. ( i know, cheap So and So lol)
I looked at my schematics, and they don't show a relay. They do, however, show two ground wires coming out of the tailgate window switch. There is a ground wire for the "up" side of the switch, and a ground wire for the "down"side. These would be color-coded black, and I think that it is worth checking to make sure you don't have a corroded /broken ground running from the tailgate switch. If only one grounding wire was broken, the window would operate in only one direction. Both dash and tailgate switches share the same wiring circuit, and these wires are "hot" all the time. It's normal when you get both sides of the motor leads at 12VDC when neither switch is activated. These switches function by switching off one of the two motor leads, and connecting it to ground, thus allowing power to flow thru the motor windings. Of course, reversing the polarity on a DC motor will change the direction of rotation, so changing which black lead is switched to ground gives the up or down direction to the motor.. since you can read schematics, you might check out ebay for a used Haynes manual cheap. hope this helps
Posted on May 26, 2010
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Posted on Jan 02, 2017
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