2005 GMC Yukon Voltage drop

2005 GMC YUKON
10,900 MILES • V8 • AWD • AUTOMATIC
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LARRYLB
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  • 2 POSTS
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.
Nov 9, 2010 at 6:29 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
I found a service bulletin for your charging system, 11.8 is a little low.


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

Nov 10, 2010 at 3:55 PM
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LARRYLB
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  • 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
Nov 10, 2010 at 6:38 PM
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