Question about 2001 GMC W3500
You should have 12 volts at the gray wire.The black is ground make sure and use this wire also.This way you know the ground is good also.When you turn the key on you will only get battery voltage for 2 seconds with the key on.If you crank the motor then you will get battery voltage also.Hope this helps.Good luck.
Posted on Sep 14, 2010
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Posted on Jan 02, 2017
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