All ActivityMost RecentMost LikesSolutionsRe: Onan Marquis 5500 put out too much voltageThank you all! My husband is reviewing everything now. Hopefully we find a fix!!Re: Onan Marquis 5500 put out too much voltagethanks! I will let my husband know to check thatOnan Marquis 5500 put out too much voltageWe bought our motorhome used and not running!!! My husband is a great mechanic and got it running. He had to clean the fuel tank, put in a new fuel pump and it fired right up...we got lucky! The previous owner had fiddled with the Onan generator and we were given a box of parts he hadn't reinstalled. My husband rebuilt the engine and it runs great but puts out too much voltage. He contacted a company called Flight Systems and run a bunch of diagnostics to determine what was wrong. They sold us a new voltage regulator. He installed it but it got fried....so they sent us another one but generator is still putting out too much voltage. When we fire it up, it puts out about 200 volts and settles to 170. He hasn't connected to the motorhome until he gets this figured out. Any suggestions would be so appreciated!