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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 trailer lights. The alternator is dual voltage, 12 and 24 volts. Each battery in the series pair has it's own charging circuit, there can be no imbalance because each battery is charged individually.... but do you need 12V and if so, how did you get it? The 916A1 needs both. Pilling 12V off of one battery will then unbalance the loading of the pair - pressumably.
.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 battery is number 2 (B+ at the top right) and is the 24 volt source. The wire with the blue tape is the 12 volt supply being pulled from the jumper between the two batteries.
View attachment 844827
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!.
Well, that isn't exactly a Mil-Spec battery hold down...
But on the other hand, that configuration would cause the crackheads and thieves to possibly "just walk on by..."
I like it. Definitely sturdy and nothing will get jostled around going down the road or trail!
Does you truck have the large red isolator/battery cutoff knob next to the battery box - if so, doesn't that not kill power to EVERYTHING?..... I turn off the 12 volt supply when the truck is not in use because the tachograph clock will kill the 12 volt supply battery in a few weeks.
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.Does you truck have the large red isolator/battery cutoff knob next to the battery box - if so, doesn't that not kill power to EVERYTHING?
I'm still waiting for you to tell me how the batteries become imbalanced. I was under the impression that the M916A1 is the same electrically as the M915A1. since I don't have that problem with my truck, what is different about your truck?... Pilling 12V off of one battery will then unbalance the loading of the pair...
Yea agree why. Ray said he has 12-24 volt charging without converter. My 915A2 has the step down converter 24 to 12 The only thing if he wanted he could install the emergency cut of switch for that 24 volt starter line or just be sure it is not rubbing metal or it is supported correct.Why?
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.If someone is worried about imbalance and only had a 24v charging system-then pulling 12 off of one would eventually cause an inbalance. By using a DC-DC converter to feed your 12v you eliminate the inbalance
Well since Howard asked specifically about inbalance I offered an alternative. That’s all.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.
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 through the TM and become familiar with how the electrical system works.Well since Howard asked specifically about inbalance I offered an alternative. That’s all.
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