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2007 Yukon Denali voltmeter up and down while parked or

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stoped- headlights and dash lights...
2007 Yukon Denali voltmeter up and down while parked or stoped- headlights and dash lights mimic the pulsing. Battery dies randomly. Nobody knows how to fix it. Alternator test comes back good and battery is 1 yr old.
Submitted: 7 months ago.Category: GMC
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Answered in 5 minutes by:
9/26/2017
GMC Mechanic: Gary, ASE Certified Technician replied 7 months ago
Gary
Gary, ASE Certified Technician
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Satisfied Customers: 17,887
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Welcome! My name is ***** ***** I will do my best to assist you with this problem.

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Customer reply replied 7 months ago
Ok. Thank you. It’s been an ongoing problem- for several years FYI.
Customer reply replied 7 months ago
Do you have some suggestions of wires etc to check?
GMC Mechanic: Gary, ASE Certified Technician replied 7 months ago

these pulse issue and other issues are either caused by the alternator OR most common a bad ground at the engine from the battery

has the ground been checked and all are clean and tight on the engine ?

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Customer reply replied 7 months ago
All have been check. All are clean and tight
GMC Mechanic: Gary, ASE Certified Technician replied 7 months ago

if all grounds are clean and tight the only thing left is internally in the alternator causing this issue i am sorry to especially with the pulsing that is showing the pulsing of the ac/dc change over

replacing the alternator should correct this issue you are having

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