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71 rear window defogger

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Old Dec 15, 2014 | 05:50 PM
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Default 71 rear window defogger

71 REAR WINDOW DEFOGGER

I just rebuilt the blower motor on my 1971 ,rear window defogger - it was dated 12/69 and is original to the car. Original GM well nuts, no marks on the screws and a drop of yellow paint on one bolt. (top front)
My question is that there are 3 wires on the switch, the purple is high and the yellow w/ the fuse is the feed. I think I found somewhere (a month ago) that the other is a resister wire for low?
The high works fine, the low (?) only sparks lightly with no motor reaction. (if it is a resistor wire -then it's bad)
My Assembly Manuel shows only 2 wires as does my wiring diagram.
Is anyone sure if there was actually 3 wires on the switch.
My 72 does not have the option so I can't use as I have in the past as my go to example.

My next adventure(s) will be the melted speedo cable and clutch. Not sure if I will use the 90 degree for the tranny connection. If anyone has any thoughts it would be appreciated.

Thanks

Last edited by BLUE1972; Dec 15, 2014 at 05:53 PM. Reason: can't spell
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Old Dec 16, 2014 | 08:25 PM
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Originally Posted by BLUE1972
71 REAR WINDOW DEFOGGER

I just rebuilt the blower motor on my 1971 ,rear window defogger - it was dated 12/69 and is original to the car. Original GM well nuts, no marks on the screws and a drop of yellow paint on one bolt. (top front)
My question is that there are 3 wires on the switch, the purple is high .

PURPLE WIRE IS HIGH SPEED, TAN WIRE IS THE FEED AND THE YELLOW WITH THE FUSE IS THE LOW.

My next adventure(s) will be the melted speedo cable and clutch. Not sure if I will use the 90 degree for the tranny connection. If anyone has any thoughts it would be appreciated.

Thanks
Traced the resister wire, it's spliced back in to the purple feed ? shows very high resistance? RE DID THE SOLDER JOINT AND ALL WORKS NOW. ALSO REBUILT THE SWITCH.

Last edited by BLUE1972; Dec 20, 2014 at 12:00 AM.
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