2007 Sprinter Voltage Overcharging
I have a 2007 Sprinter Diesel and have replaced the Alternator 4x's and JUST put another one in 3 days ago. I finally put a voltage tester on the battery terminal and when I am at idle the voltage goes from 14.1v to 19-20v and the battery light comes on, along with the seat belt alarm. When I begin driving again, the volts go back to 14v.
Thanks ahead of time.
Are you putting on OEM alternators?
It is not a Bosch. Rebuilt from O'Reilly. The alternator is working, it is just when I stop at a light or idle the volts go up to 20v.
Correct,the aftermarket alternators are back feeding,very common, you need to install a OEM alternator.
Is it coming back through the starter? I am only getting 7v from the pin on the top of the alternator (the wire from the starter).