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I got tired of buying 4 batteries when 2 work fine. With 4 batteries, when one goes bad, you have to buy 2 to replace both in that series pair. You can try replacing one, but in my experience that only makes the other one fail faster. If you have a truck that requires a lot of cranking to start...

Scroll up and read post #5.

I understand that, however the OP doesn't know how the electrical system in his truck works and suggesting a solution to a problem he doesn't have is confusing. It's better to explain how the electrical system in his truck works so he can see for himself. Maybe he will take the time and read...

That would be true for that situation. However, this thread is about a M916A1, and since a M915A1 which I have, is the same electrically, I answered OP questions based on his truck, which is a dual voltage design.

Why?

No it doesn't. I don't have to turn off the 24 volt power. There is nothing on the truck that is 24 volts except the starter and it's only on when I push the start button. I'm still waiting for you to tell me how the batteries become imbalanced. I was under the impression that the M916A1 is...

Thanks, the battery hold down is repurposed from the radio rack that was in my S-250 shelter, so it is made from mil-spec parts! You can't see it in the picture, but there is a relay and circuit breaker between the batteries on the 12 volt supply wire. I turn off the 12 volt supply when the...

Here is a picture of my M915A1 battery installation. I was looking at a picture of my M929 batteries and got the type of battery wrong in my first post. You can read the battery type from the picture. The left battery is number one (B- at the top left) and is the 12 volt source, the right...

The M915A1 is all 12 volts except for the starter and provision to power 24 volt trailer lights. Mine also has air conditioning and that is 12 volts too. The 12 volt circuit is powered from the first battery in the series pair. The second battery is only used for starting and powering 24 volt...

I put a couple of the 1140 CCA Super Start AGM batteries from Walmart in my M915A1. They were $150 each, have a 5 year replacement, 7 year pro-rated warranty. You have to make a hold down bracket because of the size.