Compression Ignition Addict
Join Date: Dec 2007
Thanked 311 Times in 300 Posts
Mentioned: 9 Post(s)
Quoted: 169 Post(s)
Feedback Score: 3 reviews
Couple of things, First did you recharge your batteries on a battery charger after they went low, or let the alternator do it? Your charging system isn't a good way to recharge dead batteries. It just isn't going to do the job unless you drive for hours at a good rpm. Plus, overtaxing the alt is never worth the risk of damaging it.
Second, you should stop guessing about the condition of your batteries (they are So Important to a diesel w/GPs) and have them LOAD TESTED. Take them out, put them on a charger and be sure they're both Fully Charged, and take them to someone with a good Load Tester (NOT one of those 100A handhelds that some of the Auto Parts Stores try to use) and have then tested at a High Rate (200-300A) to know if they need replacing.
Then you know where you stand with the batteries and can look elsewhere if the problem continues.