why does my 99 z71 shut off after being jumped off and unhook the cables it cuts off

Asked by Feb 22, 2015 at 05:31 PM about the 1999 Chevrolet Silverado 1500 3 Dr LT 4WD Extended Cab LB

Question type: Maintenance & Repair

1 Answer

78,085

Sounds like a bad alternator. If the alternator fails the engine will continue to run off the battery until it's dead. Once the battery is dead and the alternator is not working there's no power for the ignition system so the engine stops. By leaving jumper cables on you're actually using the other vehicle's electric system to run your engine. HTH. -Jim

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