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post #1 of 6 (permalink) Old 01-10-13, 10:54 AM Thread Starter
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intermittent power window

Does anybody else have a power window that sometimes works and sometimes does not? My 99 p71 passenger front window works about 30% of the time. It is not the switch, because both the master switch and the switch on the passenger door don't activate it when its broken. I tried wiggling the various relays and what not with no change. I have not opened up the door to look inside yet. Its probably a bad or loose circuit somewhere, but these cars have so many circuits everywhere, that I have no idea which one is the power window circuit.

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post #2 of 6 (permalink) Old 01-10-13, 06:57 PM
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Re: intermittent power window

I'd check inside the door and where it passes through from the door into the dash first. The relay only supplies power when the ignition switch is in any position but off. Unfortunately, I don't know if anything piggybacks on the same relay, or if there's one dedicated to the windows.

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post #3 of 6 (permalink) Old 01-10-13, 09:26 PM
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Re: intermittent power window

It could still be the passenger switch since the power goes through it from either side. Check for power with the diagram when it's not working to see where the problem lies. Check Fig. 3 | Repair Guides | Windows (1999) | Windows (1999) |

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post #4 of 6 (permalink) Old 01-11-13, 03:35 AM
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Re: intermittent power window

sounds like you have a loose connection where the wires plug into the window switches. I'd say try to find a new switch assembly.
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post #5 of 6 (permalink) Old 01-13-13, 08:55 AM
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Re: intermittent power window

I had the same problem with my 400,000 mile '92. I just sprayed WD 40 into the switch and was surprised that such a simple fix worked. It's worth a try before you start tearing it apart.
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post #6 of 6 (permalink) Old 01-29-13, 10:02 PM
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Re: intermittent power window

I just had a GM come in the shop today with the exact same problem. It was the passenger side switch that had gone bad. Another Ford (truck) a week ago had the same problem, driver side switch. Change out a known good one with your passenger first and see if it fixes your problem. Good luck.

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