The emergency start switch is a two way street - it ties both batteries together.
I've used the emergency start switch to start the genny when the coach batteries were run down... I'd expect it would work if the coach batteries weren't present - but be sure the vacant positive lead is secured away from any metal parts....
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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