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Old 06-26-2013, 10:04 AM   #1
Junior Member
Join Date: May 2013
Posts: 5
voltage regulator issue on genset

Hello All,

Hope to get some advice from you experianced ones here.
We on the road and the genset stopped running. Shop in
the area said the voltage regulator is bad, needs replaced.
Does not have, he called parts house in another town and they
Shop guy says we can change it ourselves easily.

Any thoughts, advice? This is a 98 Onan Emerald genset.
Mainly I see no way to disconnect power to the genset without
disconnecting all the batteries.

Anyone with more knowledge and experiance please advise.
Cannot get back on the road without the roof a/c running.

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Old 06-26-2013, 10:31 AM   #2
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clyon51's Avatar
Fleetwood Owners Club
Workhorse Chassis Owner
Join Date: Mar 2012
Location: Presently White Tank Mtn Regional Park, AZ
Posts: 3,757
With generator not running, just replace regulator. No need to disconnect anything.

John & Clare - Buck & Zeus - Jack & Husky
2008 Fleetwood Bounder 38P
Towd: 2 HD Streetglides
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Old 06-26-2013, 10:56 AM   #3
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Ford Super Duty Owner
Join Date: Jan 2013
Posts: 232
I would disconnect the batteries before starting to work on the generator for a couple reasons...first so no one can start it while your hands are in there and second because there is still live DC voltage on some wires from the batteries even with the generator switched off.

Safety first.
97 Gulfstream SunVoyager
96 Ford F53 chassis
Windsor, Ontario, Canada
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Old 06-26-2013, 01:25 PM   #4
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Join Date: Nov 2011
Location: Full time RV'er
Posts: 1,238
Voltage regulators are often misdiagnosed as bad if the testing procedure isn't followed carefully. There are two slip rings in the genset that need to be cleaned periodically...especially if the genset is low hours and hasn't been run enough.

A square 1/4" stick with a piece of emery cloth glued to the end that you put on the rings while it's running or cranking over may restore your genset for a couple bucks.

Here are the guys with the troubleshooting guide: http://www.flightsystems.com/Onan_ge...g_services.htm
'02 Winnebago Journey DL, DSDP, 36' of fun.

Visit my RV Travel & Repair Blog at : http://chaos.goblinbox.com
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Old 06-26-2013, 08:21 PM   #5
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Fleetwood Owners Club
Join Date: Nov 2011
Posts: 24
Just changed voltage regulated last week.

Has one or two screws holding it in place.

Generator guy unplugged old one and plugged in new one before he took it out and confirmed it was the problem.

My beef was that they charged me over $500.00 for the part.

Checked later and found it online for $199.00.

Just take screws out unplug and plug in new one.
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Old 06-26-2013, 09:00 PM   #6
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Join Date: May 2012
Location: Bandera Texas For the most part
Posts: 55
Talking Voltage Reg.

Advice on Flight Systems was right on. You can call Dan at 1 800 403 3728 and he can walk you thru the fix. They also have parts at fair price.. Had me up and running in no time..

Good Luck, Chuck
Chuck and Dot
2015 38RSB3 DRV Mobil Suite
2014 250 Ford Diesel Super Duty
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Old 06-27-2013, 08:07 AM   #7
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Join Date: Jul 2011
Posts: 2,200
Find out the part number and look for it online.
The previous owner had the voltage regulator changed out 7/15/2009 at a cost of $100 and then again in 1/6/2011 for a cost of $68. Those prices were just for the part and did not include labor
We did some research and found the part at an auto parts store for $25. And that was at whats usually considered one of the more expensive auto parts stores.

Thom and Christine having fun in a 1993 Monaco Crown Royale Signature Series 40ft 300hp RV. Towing a Fiat 500 Abarth and a Harley.
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