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2005 GMC Yukon Voltage drop

Tiny
LARRYLB
  • MEMBER
  • 2005 GMC YUKON
  • V8
  • AWD
  • AUTOMATIC
  • 10,900 MILES
When car heats up, 20 miles or so, the voltage as shown on the gage drops to about 11.8 volts. When you turn on the lights, it will slowly climb to 14.8 volts. Other than that every thing still works, but I assume my battery will give out early.
Tuesday, November 9th, 2010 AT 6:29 PM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I found a service bulletin for your charging system, 11.8 is a little low.


https://www.2carpros.com/forum/automotive_pictures/170934_yukon_charging_system_1.jpg

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Wednesday, November 10th, 2010 AT 3:55 PM
Tiny
LARRYLB
  • MEMBER
  • 2 POSTS
Follow up that may have an effect. Alternator is newly replaced with new, not rebuilt. It did not do this with the old unit. This is a Bosch alternator.

Larry
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Wednesday, November 10th, 2010 AT 6:38 PM

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