Duramax Fifth Generation: 2011-2016 (LML)
2013 Duramax alternator erratic action after startup and running. drop below 9V and may jump to 10/11 and back
down again or anything between. Increase RPM may or not change the action. Testmeter and dash guage show same events. Cutting loads, by shutting of grid heater/lift pump/DEF heater and...