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[–] • 0 pt 2y

02 GMC Yukon XL

[–] • 0 pt 2y (edited 2y)

Does it have an onstar? Sometimes the GPS units will slowly drain power whether or not you pay for the service

[–] • 0 pt 2y

Yeah

[–] • 0 pt 2y

I'd look into the onstar GPS antenna draining your battery, or possibly try getting a new alternator and battery