Are you sure the disconnect switches are on? Sorry, had to ask.
I'd focus on getting the generator running.
Disconnect the negative cable from the house batteries.
Hook jumper cables from running car or battery charger with boost start capability to the +ve cable of the house bank first and then to the disconnected negative. Of course make sure the negative doesn't touch the positive.
Turn on the battery disconnect switch for the house bank.
Start generator.
Leaving the generator running, disconnect the negative the jumper cable or battery charger. Keep negative away from the positive.
Leaving the generator running, reconnect the negative to the batteries.
Generator should produce enough to retract the levelers, start the engine via the boost switch, and begin charging everything.
If you cannot get a jumper cable to the house batteries, jump start the engine. Hold the boost switch while trying to start the generator. The boost switch may need to be held for a few minutes to build up enough charge.
