I have driven this approx 400miles and have had the fan/ac just stop then come back on for no apparent reason. Today went to get fuel filled up then truck wouldn't roll over. I jumped it and went to parts place batt is 4 years old and sides were bowed. They tested and said it was bad. So I put new batt-1000ca in Then tested system again and showed 12.57 amps and was told I needed new alternator pr-$269.00. The guy told me to take it out and have it rebuilt for about $80.00 locally and told me where. My problem is I drove the truck at least 10 miles with bad batt and Alt. is this possible with a diesel? According to the papers I have with the truck Alt batt+ cables were replaced last year! My father in-law 1200miles away who is an owner operator trucker for last 20 years and was a trained diesel mech prior to driving thinks it could be wiring and ground problems. ANY IDEAS WOULD BE HELPFUL> I plan on messing with the ground later when I get a chance.