Stop in for a cup of coffee

Tooljunkie said

Fully charged battery out of factory is 13.2. Running voltage is minimum 1 volt above battery voltage with accessories on. So with Daves battery at 12.7, engine on and all the goodies running should be no less than 13.7. Ideal is 14.2 to 14.6.

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Hi there. The newer vehicles are quite different. My 2015 Yukon runs at 12.7 volts in idea conditions. It also takes a special battery. This is a fuel saving software to reduce the load on the engine. When I purchased it I had to research the service manual. I just got rid of that piece of junk and bought a new Dodge Caravan. Mopar baby!