I don't want to offend with such a simple suggestion, but I have had this problem as I was working on mine the light would work then I'd make an adjustment and go to retest and it wouldn't work. And it was just the ground alligator clip not getting a good bite, or loosening as I'd move the gun around.
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'02 Explorer XLT 4.0L --Nice Vehicle
'97 Saturn SL1--Soon to be ditched for a Ford!
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