Onan voltage regulater

Rich Biebel · 05-05-2017, 12:00 PM

Won't help. It's never been an issue. First thing to check on those is always brushes, and slip rings. The brushes ride on those slip rings. Copper surfaces on the rotor. A normal ohm reading right at the back of the brushes with at least one wire pulled off........about 20-30 ohms. If brushes and slips are good you can pull wires off brushes, tape them up and connect a 12volt battery or better yet a 24 volt supply right on there and run it. Output should be produced although it will be low. That test will be proving the rotor and stator are good. 30 to 60 volts D.C. is the normal range there. Marquis' are complex units with electronic governors. Harder to diagnose than manual governors. Pretty easy for me though.

05-05-2017, 12:00 PM	#9
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,315 Likes: 25 Liked 544 Times in 213 Posts	Re: Onan voltage regulater Won't help. It's never been an issue. First thing to check on those is always brushes, and slip rings. The brushes ride on those slip rings. Copper surfaces on the rotor. A normal ohm reading right at the back of the brushes with at least one wire pulled off........about 20-30 ohms. If brushes and slips are good you can pull wires off brushes, tape them up and connect a 12volt battery or better yet a 24 volt supply right on there and run it. Output should be produced although it will be low. That test will be proving the rotor and stator are good. 30 to 60 volts D.C. is the normal range there. Marquis' are complex units with electronic governors. Harder to diagnose than manual governors. Pretty easy for me though. __________________ Rich Biebel S/C 1479 Stock 147R