Hello, My gasoline powered Onan 4.5 kw generator runs great in the dry weather, but after a hard rain runs very roughly and sometimes won't start at all. Once it dries out, it runs fine. It's mounted outside, but sheltered from the weather, so it doesn't get directly wet but rather just moist from sustained high humidity during stormy weather. I assume the problem is in the electrical system. I'm not too familiar with small engines, but can identify the plugs, wires, points, and coil. Money is tight as usual, and I'd like to handle this problem myself if I can. Any suggestions will be appreciated.
TIA Tom Durham, North Carolina