CLASS RACER FORUM - View Single Post - Duramax vs. Cummins- Need some feedback

Roger K Fain · 12-19-2008, 01:45 PM

I have an '03 Duramax Dually w/ 73K, and it runs and pulls hard w/ the best of 'em, and gets about 12.8 mpg towing, and 20 non-tow. However, it has a feature that switches the charge from the alternator between the two batteries, that causes one battery to overcharge and "puke' acid. I have had the batteries replaced three times under the NAPA battery warranty. I have had the system checked and can find no malfunction in the switching program. Anyone out there ever had a similar problem?

12-19-2008, 01:45 PM	#13
Roger K Fain Member Join Date: Mar 2006 Location: Clarksburg, WV Posts: 146 Likes: 0 Liked 0 Times in 0 Posts	Re: Duramax vs. Cummins- Need some feedback I have an '03 Duramax Dually w/ 73K, and it runs and pulls hard w/ the best of 'em, and gets about 12.8 mpg towing, and 20 non-tow. However, it has a feature that switches the charge from the alternator between the two batteries, that causes one battery to overcharge and "puke' acid. I have had the batteries replaced three times under the NAPA battery warranty. I have had the system checked and can find no malfunction in the switching program. Anyone out there ever had a similar problem?