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I set up two batteries separate from the truck batteries with a golf cart solenoid to allow for 12 or 24 volt jump starts along with a quick connect jumper cable setup. The truck while running charged them.
It's been a while since I had this setup I used a series parralel switch. I cant wrap my head around how you could make it work without a switch and maintain the batteries equally. 24volt jumper in place of starter
If i had a very new truck i would not do this. If i was needing to do this alot i would get 2 spare bats to haul around if you hauled a welder or had a coverter to charge them.
They ran series parralel switches on trucks with 24 volt starters for a long time. If switch goes bad you just dont have 24volt output. The switch is the only way I would do it
That looks exactly like what Kenworth used to use on their old 24/12 systems. I believe I've seen it an an old IH loadstar or transtar with a super 290 as well. That old girl still had the compression relief under the dash.
What I ended up doing is just add 2 batteries 1000 amp each in steal box wired in series / parallel switch just like 70s Kenworth so battery’s charge off truck alt quick connector for jump start cables so I can use same cables for 12 volt off truck batteries a switch in box panel to control s/p switch .