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Open Roads Forum  >  Tech Issues

 > Onan Marquis 5500 put out too much voltage

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SuzanneNS

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Posted: 07/02/20 11:39am Link  |  Quote  |  Print  |  Notify Moderator

We 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!

2oldman

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Posted: 07/02/20 11:42am Link  |  Quote  |  Print  |  Notify Moderator

Lots of hits on that on google. Perhaps it's running too fast.

Lwiddis

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Posted: 07/02/20 11:49am Link  |  Quote  |  Print  |  Notify Moderator

"He hasn't connected to the motorhome until he gets this figured out."

And be very sure it is fixed before you do.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL pole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - (MOS 1542 & 1560)


bgum

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Posted: 07/02/20 12:05pm Link  |  Quote  |  Print  |  Notify Moderator

Old man has the answer for the first thing to check.

SuzanneNS

calgary

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Posted: 07/02/20 12:07pm Link  |  Quote  |  Print  |  Notify Moderator

thanks! I will let my husband know to check that

MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 07/02/20 05:18pm Link  |  Quote  |  Print  |  Notify Moderator

The motor would have to be screaming fast to put out that voltage

Dusty R

Charlotte Michigan 48813

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Posted: 07/02/20 07:17pm Link  |  Quote  |  Print  |  Notify Moderator

Check the RPM the engine is putting out and find out how many RPM it's rated at.

STBRetired

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Posted: 07/02/20 07:33pm Link  |  Quote  |  Print  |  Notify Moderator

The engine is supposed to be running at 1800 RPM. Look at the rating plate on the right side.


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MrWizard

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Posted: 07/02/20 11:35pm Link  |  Quote  |  Print  |  Notify Moderator

Get the model #
From the data plate on the onan
Download the service manual
All of these older generators are capable of putting out 230v, it depends on how the 4 output wires from the stator (out put windings) are connected,
At 200v , it is probably connected for 230 but running too slow to produce full voltage
Flight system control boards are the best there is


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Kpackpackkelley

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Posted: 07/03/20 07:13am Link  |  Quote  |  Print  |  Notify Moderator

Need the full model number

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