Make sure that both isolator switches by your entrance door are on. My lamps are burned out, so I make sure something on the dash is lit (leveler LEDs) and a ceiling light will light as proof that both isolators are on.
The only suggestion I might have is to start your generator first. That uses the house batteries which you indicated were OK. The generator will charge the house batteries thru the converter. Leave it run for a while.
After a little while (5 to 10 minutes), depress & hold the emergency start switch for another period of time to allow the engine battery to accumulate some charge.
Then with generator still running, and emergency start switch depressed, attempt to start your engine.
If you continue to experience slow cranks, then it is time to check battery wire connections or the battery itself.
Let us know how you make out.
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