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Do you own a DC volt meter to do some tests?
first off I need you to turn on the headlights (engine off), Leave them on for 30 seconds then turn them off, now check the battery voltage after waiting 1 minute________?
Now start the vehicle and turn everything electronic off and check the battery voltage______?
Now while still running turn o nthe headlights and climate control blower on high and the wipers on high and tell me the battery voltage_______?
Headlights on 30 seconds,then off, check after 1 minute =12.47V
Engine on all electronics off=12.85V
Engine running, lights on, blower on, wipers on full = 10.9V to 11.5V (fluctuating)