P0621.. Help please. I have installed 2 new batteries and 2 new reman alts. Still not charging and the battery light is still on. Can anyone lead me to finding the issue here? This is on a 2013 Chevy Express duramax Ambulance. Thanks
210

Asked by Brian Oct 12, 2016 at 11:29 AM about the 2013 Chevrolet Express Cargo 3500 Diesel RWD

Question type: Maintenance & Repair

4 Answers
210

Brian answered 7 years ago

I am also having there very same issue with one of our 2006 Chevy Express 6.6L ..

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Tech_time answered 6 years ago

I'm working on a 2009 Express duramax ambulance as well, with dual alt setup. P0621.. but charging voltage is 13.3V - battery light on - Key on, engine off and key on, engine Running only 2.9 volts running to the L (lamp) circuit. Tested wiring from alternator connectors to ECM with good readings (0.4 ohms). Going to finish the diag Monday morning will keep you posted

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Tech_time answered 6 years ago

Brian did you end up finding your problem? I noticed your post is from a year ago now...

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10

Tech_time answered 6 years ago

Primary (passenger side) alternator was not pulling to ground on signal circuit (orange wire) key ON engine OFF. Replaced alternator and re-test - good now

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