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Old 11-14-2005, 09:26 AM   #1
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I am getting 146 volts out of my outlets when the generater is running. Is there a quick fix for this. Is there a voltage regulator on the genset that has gone bad. If i rev the genset the volts shoot up. I have searched the forums but have found nothing useful.
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Old 11-14-2005, 09:26 AM   #2
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I am getting 146 volts out of my outlets when the generater is running. Is there a quick fix for this. Is there a voltage regulator on the genset that has gone bad. If i rev the genset the volts shoot up. I have searched the forums but have found nothing useful.
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Old 11-14-2005, 12:47 PM   #3
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Hi Ho: You need to be sure that some minimal load is on the generator before measuring the voltage. The regulator requires a couple of hundred watts to properly stabilize on some generators. Beyond that, yes there is an adjustment on the regulator. It isn't a voltage regulator, but rather a mechanical regulator on most motor generators, but there is an adjustment. The trick is to get 60 Hz and the same time that the voltage is approximately 120 volts as both will change with speed. What kind of meter are you using? That may also make a difference.
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Old 11-14-2005, 01:22 PM   #4
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On my Onan 7.5, the speed is varible (according to load) as the engine turns an alternator which powers an inverter (!) Most other gen sets use a regulated speed (either 1800 or 3600 rpm) to produce 60 Hz. Dirk is right-on.

The first time I heard the genny change speed on the coach, I feaked out.
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Old 11-14-2005, 01:39 PM   #5
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Model and spec number of the generator?
If a 7.5 Quiet diesel, will be one issue, if a gas or propane model, will be something entirely different.
If a gas or propane, might be the engine is running a little fast. Borrow a frequency meter and see what you have, it should be 61.5 at no load. If higher, adjust it down to that level. This will be a governor adjustment. Read the manual and understand what you are planning to do before proceeding. There are more than one adjustments that are possible in/to the governor system (uless it is an electronic governor or it is a diesel, which we could determine from a model/spec number) and know which will do what BEFORE proceeding.
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Old 11-28-2005, 08:17 AM   #6
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Sorry it has taken awhile to get back to me, I do not have a maintenance manual on my genset, but it is gas/propane, where is the governor setting?
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Old 11-28-2005, 08:20 AM   #7
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This issue just started up one day. It was putting out 146 volts overloading my inverter and causing it not to work. It works when plugged in to shore power, with only 118 volts.
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Old 11-28-2005, 08:36 AM   #8
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I removed the air filter off of the Onan generator and saw it was nasty, I will replace it and the fuel filter. I decided to see if that helped anything, made it worse, my voltage went from 146, to 151.

It is an Onan Model number 7NHFA26105G.
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Old 11-28-2005, 09:04 AM   #9
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Onan Marquis 7000 is the model
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Old 11-28-2005, 10:20 AM   #10
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Hi Ho: It sounds like you might have something in the governor that is broken/stuck. Be careful that you don't ruin electrical things that are connected to the generator while you're investigating. In fact, Onan discourages owners to adjust things that might change the output. You might play with the throttle/governor and see if you can find out what has changed since it was working properly. See http://www.onan.com/pdf/rv/f-1123.pdf I'm sure you can get a service manual if you really want to go further. The web is often a good source for such things. Good luck.
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Old 11-28-2005, 01:02 PM   #11
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Dirk, do you have a picture of where the adjustment is located?

I have access to a meter to watch the hertz.
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Old 11-28-2005, 03:27 PM   #12
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Hi Ho Bill: Apparently the Marquis Platinum 7000 has digital voltage regulation, so previous comments about a mechanical regulator don't apply. In fact, I don't even know if this beast has controls that can be adjusted. This proves that generalizations based on equipment that is known or owned may be counter-productive. That is the bad news. The good news is that this is one of the best gas generators that Onan makes. I don't have a service manual, but I think that Onan 983-0501C may be the manual you are looking for. Good luck.
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Old 12-02-2005, 11:05 AM   #13
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Do not make any adjustments to that generator without being hooked up to a load bank measuring watts, amps, and hertz.

You may fry enough stuff in your coach to make the repair bill at the dealer look small.

How long have you had the coach? Onan has a 3 year warranty. First two are parts and labor, the last is major parts.
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Old 12-03-2005, 08:59 AM   #14
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Again, need a model, spec and serial number to give any meaningful advice. Without those, anyone would be guessing and may very well pass on advice/suggestions that do not apply to your machine.
If your generaotr output varies more than 5% between no load and full load, you got some other issues that need to be addressed.
Anyone do anything to your generaotr? Service? Adjustment of any kind?
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