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4 of the alts came with the truck and we're tested. 1 I just purchased from a e bay site that is selling new ones. It was delivered with a test report showing 13.9. The problem started when a buddy changed out both batteries a year ago while I was in the hospital. He connected the batteries...

Hi guys, I have reached my limit on my m1009 charging system. New batteries, 5 new alternators , front starting battery doesnt get more than 12.1 volts. I have spent 6 months going over TM,s and trying everything posted. I HAVE TAKEN IT TO the Chevy dealership, and 3 diesel shops , Every shop...