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What's this part and what does it do? (Pic)

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Old Mar 22, 2007 | 10:49 PM
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Default What's this part and what does it do? (Pic)

My power windows quit working. I traced the wires back to this component (see pic). It has 2 plugs. The brown plug has a pink wire and a yellow wire with the yellow one being hot. The black plug has a red wire. The red wire runs to the power window switches and I'm thinking it should be hot but it's not. There are 4 other wires running back to the power windows. 2 blue and 2 brown. Of the 5 wires I've mentioned (2 blue, 2 brown, and one red) which one(s) are supposed to be hot. Thanks.
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Last edited by TXredc3; Mar 22, 2007 at 10:57 PM.
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Old Mar 22, 2007 | 10:59 PM
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i wonder if that is a relay for the rear window defroster?
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Old Mar 22, 2007 | 11:12 PM
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The power window relay is energized only when the ignition is on. If you don't get help tonight, I'll check my wiring diagrams when I get to work tomorrow.
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Old Mar 22, 2007 | 11:17 PM
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It's the power window relay. The pink wire in the brown plug should go hot with the ignition on as should the red wire running to the power window switches. If the pink wire going to the brown plug isn't hot with the ignition on, there is a 10 amp fuse in fuse panel for this circuit that you should check. If the red wire going to the switches isn't hot with the ignition on then the relay is likely bad.
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Old Mar 22, 2007 | 11:18 PM
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Originally Posted by big_G
The power window relay is energized only when the ignition is on. If you don't get help tonight, I'll check my wiring diagrams when I get to work tomorrow.
I think you're right Big G. This problem starting after tearing apart my drivers dash to install 4 sp pedals. Moved around a bunch of wires. Is there a fuse in the box that controls the power windows or is there a breaker somewhere else?
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Old Mar 22, 2007 | 11:25 PM
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Originally Posted by gdm78vette
It's the power window relay. The pink wire in the brown plug should go hot with the ignition on as should the red wire running to the power window switches. If the pink wire going to the brown plug isn't hot with the ignition on, there is a 10 amp fuse in fuse panel for this circuit that you should check. If the red wire going to the switches isn't hot with the ignition on then the relay is likely bad.

The 10 amp fuse looks good. The yellow wire in the brown plug is hot instead of the pink one. Should both wires be hot??
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Old Mar 22, 2007 | 11:48 PM
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Originally Posted by TXredc3
The 10 amp fuse looks good. The yellow wire in the brown plug is hot instead of the pink one. Should both wires be hot??
The Yellow one should be hot all the time. The pink one should be hot only it the ignition is on.

According to my '78 wiring diagram the 10 amp fuse should be labeled IGN.

Last edited by gdm78vette; Mar 22, 2007 at 11:56 PM.
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Old Mar 23, 2007 | 09:01 AM
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i was checking this out a while back on my car. both wires are hot - each one runs the motor a different directions. then of course it grounds to the metal on the door when it's bolted on.
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