W7BE_Bob Posted March 24, 2020 Share Posted March 24, 2020 For reference. My 09 42’ Scepter with a 10K gen is slow cranking except when driving or the batteries are being charged. And much more so in cooler weather. I’ve known for some time that the voltage is low at the gen. The gen is connected to the house batteries. Summary: ALL connections are clean and good including lug to wire connections. I used a battery load tester connected to the gen end of the positive cable to measure voltage with a 85A load. The 1/O 44’ positive cable has a 0.4V drop (same as a wire wire calculator) and the ground which uses the frame has a 0.4V drop and the Monaco Blue Seas switch has a 0.4V drop. Other drops are small. Replacing the switch and using 2 4/O cables will help but would still be marginal. Not to mention what’s involved adding those cables. Clearly the best solution is to install a small battery and battery isolator next to the gen. Link to comment Share on other sites More sharing options...
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