Generator won’t start

this is very different from your first post.

The generator starts when I push the start button on the generator but not the inside switch. When I push the inside switch all the power goes out.

By all means check wiring and connections. Be sure to check GROUND connections as carefully as you check the Positive. We've had a couple recent cases where the Ground Cable at the Generator was the problem.

If you are plugged into shore power and the lights go out when you press the start button there is a chance that only corroded cable ends at the battery are to blame.

If you disconnect from shore power and the slightest load causes the lights to dim or go out, then it would be bad batteries or batteries that are not being charged.

Go pull the shore power plug and see.

X2 sure sounds like a battery problem, whens the last time you checked the water in them? cleaned the cables an post.first place I,d start.

Bad/corroded connection, clean and tighten the cables.