From your comments one might assume you are not near shore power.
Our 7.5K Onan genny starts from the 2 chassis batteries (vs 4 coach batteries)
All good pointers to try from others as stated.
Another option would be using jumper cables from the running toad to the correct battery bank(s) or to 12v taps (jump starter lugs) near the genny to get the genny started.
All coaches are no made or wired the same.
You do carry jumper cables, right?
Good luck.
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1999 Newmar Mountain Aire MADP 4080, Cummins ISC 8.3L, Allison, Spartan MM IFS, Howard Power Center, Chev Trailblazer LTZ Towed w/ BlueOx rigging, Segway X2.
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