I just bought a 02 silverado and the voltmeter goes from norm to 14 and the headlights and dashlights dim in and out I took it back to the dealer they said the alternator was replaced in 2010 and the battery is fine they say nothing is wrong but when I go to work in the morning the volt meter jumps and the headlights and dash lights dim and it happens going at 30 mph or if I am doing 65 mph any ideas and should I take it back to the dealer and leave it with them till they figure it out! thank you!

SOURCE: When driving my 2002 silverado my lights will dim

Most likely it is the voltage regulator in the alternator . this is common of a alternator be for going bad, some times this is caused from jump starting.rarely it could be a intermittent short. but it would save a lot of time to have the alternator Thrilley tested or even replaced.it really don't mater about the volt out put.if the reg. is failing .hope this helps .if you want any further assistance feel free to ask.we are here to help.

mike loshbough

• 1011 Answers
• Posted on Aug 23, 2009

SOURCE: chevy silverado 1500 engine light come on at 65

Autozone will check the codes for free .Itsounds like a secondary ignition problem possible plug wires :)

SOURCE: My Silverado runs fine and when I get up to 45

MAKE SURE ENGINE IS IN FINE TUNE AND CHECK TRANSMISSION FLUID LEVEL MAKE SURE FLUID LEVEL IS ON THE FULL MARK ON DIP STICK WITH CAR AND TRANSMISSION IN OPERATING TEMPERATURE. CHECK THROTTLE CABLE BINDING OR OUT OF ADJUSTMENT.THE GOVERNOR VALVE STICKING.THE 1 - 2 SHIFT SOLENOID FAULTY OR 1 - 2 SHIFT VALVE STICKING.