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RamblinAnne's avatar
RamblinAnne
Explorer
Apr 17, 2017

Starting Generator with dead batteries

So I bought a TC that I'm currently remodeling. The generator seems to be in good condition (Onan 2500, propane). When I first got it, I tested it and it ran fine. But the battery that came with the camper (12V Group 31 AGM) is totally dead. Now, I can't get the generator to start. (I still find it ridiculous that I need charged batteries to start my generator to charge my batteries).

Anyway.. I will get new batteries eventually but I really just want to run my generator here and there to keep her in good shape. How am I supposed to start it up without working batteries?? Can I use my truck to jump start? I plug into my house's 110V once in awhile for power while I'm working in there but I guess this doesn't do anything to help it start up? Should it? Is something wrong?

Sorry so many questions.. I am clearly a newb.
Truck Campers

24 Replies

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  • RamblinAnne's avatar
    RamblinAnne
    Explorer
    Apr 17, 2017
    Thank you guys!! I figured this was a relatively simple solution but I wanted to make sure before I did something potentially dangerous.
  • Kayteg1's avatar
    Kayteg1
    Explorer II
    Apr 17, 2017
    My camper is having 30 amp charging cable from the truck, so when my camper battery would not turn the generator, starting the truck engine, giving it 1 minute to restore camper battery was enough to turn the generator.
    For generator starting you can get one of those cigarette pack-sized battery and keep it separately.
    I hope you have good converter. Mine from 2004 has some tricky power management, that with high current will overheat and shut down for several minutes.
    Basically useless for quick charge, that is why I carry computerized 25 amp charger.
  • Reddog1's avatar
    Reddog1
    Explorer II
    Apr 17, 2017
    I can't help you other than suggesting jumper cables long enough to go from the truck batteries to the generator.

    Your question reminded me of what comes first, the chicken or the egg.

    Wayne
  • enblethen's avatar
    enblethen
    Nomad
    Apr 17, 2017
    Yes, jumper to the TC battery and start it up. Disconnect jumper cables. Once started, it should charge the battery via the converter.

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