I do not believe you have a starter problem. Why would it not start on chassis batteries and will stert on house batteries? It sounds like you have a problem with the battery cables. Check and clean both hot and ground cables.
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1998 Pace Arrow 35 ft. F53 Ford V10 2014 Honda CRV toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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