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Old 09-19-2015, 01:40 PM
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Default gm alt plug wire colors

I just got a pair of singer alts. One has a conversion plug with 3 wires (green, yellow, and blue). The other just has a pig tail with 2 wires(blue and yellow). My truck has to wires going to its orignal plug. When I turn my key on it gives power to the green and yellow on the conversion plug and does nothing for the blue. So does anyone know what the colors indicate? I think it needs one sense and one ignition on/off wire.
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Old 09-20-2015, 04:14 PM
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Heres a few pics, small gm cases



Heres the plug that goes to my stock plug, its to wires and gives 12 volts to the yellow and green wires, nothing to the blue.



Now heres the other alt with only a yellow and blue wire.

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Old 09-20-2015, 04:24 PM
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Yellow to a switched 12- on and off with key
Blue can go to output post on alt with battery cable as it is a voltage sensing input for voltage regulator but will work without it hooked up as well

Last edited by chasinbass; 09-20-2015 at 04:26 PM.
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