2003 GMC Yukon altenater charging

2003 GMC YUKON
98,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
WILLIEPRICE1
  • MEMBER
  • 1 POST
i replaced my battery about 2 months ago while the engine was running. i just was told yesterday you shouldn't do that,(the called it deadheading the altenater) which now i know why, my volt meter was always peged way past 19 volts, so after 2-2-1/2 months i thought i probably fried my altenater so i just repaced my altenater and the gage still goes past 19 volts. another gay says that i probably have something else going on, maybe in the computer?
Feb 22, 2008 at 4:15 PM
Advertisement
Avatar
MASTERTECHTIM
  • CERTIFIED EXPERT
  • 4,750 POSTS
check the volts at the battery while running with a multimeter, it should be around 14.2v
Feb 22, 2008 at 4:36 PM