1986 Chevy Truck truck won't run when I disconnect the batt

1986 CHEVROLET TRUCK
53,000 MILES • V8 • 4WD • AUTOMATIC
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RICHEPALMER
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  • 1 POST
My truck has a 73 big block w/plow. I have had the alternater, starter, and battery checked all are ok. When I disconnect the positive or the ground battery cables the truck shuts off. what else can it be.
Feb 10, 2008 at 6:55 PM
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MASTERTECHTIM
  • ✓ASE Certified Mechanic
  • 4,750 POSTS
  • ASE Certified Mechanic
well if it wasnt the alternator before, it is now. it is very very bad to disconnect battery cable when vehicle is running. the alternator full fields and you can blow it up real fast. check for voltage at the back of the alternator at both the red wires. if you have voltage at both these wires then your alternator is bad. if one of the wires does not have power then this is your problem. hope this helps
Feb 10, 2008 at 6:58 PM
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