2006 gmc serria 1500. V6 4.3 Service charging system

Question

2006 gmc serria. V6 . Service charging system. Lights on truck flicker and volts are jumping around from 12 to 15 amps

Answer 1

HI there

This is usually the result of a bad voltage regulator. Test it under load, headlights, wipers and blower motor on. If the alternator isn't putting out at least 14.3 volts, replace it.