You have isolator studs at back of genny so 4 cables there. It probably has a frame ground within a few feet. My 95 pos cable comes up to front elect bay positive isolator stud through pod. That's where branches back to genny.
I had similar symptom on my Generac and starter was weak.it would only crank over at fully charged or charging batts. Just that extra half to volt made the difference. Theres also a starter solenoid in genny box. Start with the positives and ground at genny. I did take the time to clean every single battery cable connection . Probably save me other problems /pay off down the road.
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95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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