Don't risk it, I lost a $300.00 onan control board, for a new Muffler and tailpipe.
they paid, after I raised all Hell with them. disconnect all battery cables and the harness connectors to any electronic controllers. Genset, trans, engine.
Damn, I'm Good!
"I've got dozzens of friends, and the fun never ends, that is, as long as I'm buying."