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Onan 6.5 NHE transformer(voltage) regulator


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  #1  
Old 03-03-2013, 12:32 AM
vwmark68 vwmark68 is offline
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Default Onan 6.5 NHE transformer(voltage) regulator

Here are my specs

Onan 6.5 emerald 3

serial # A870865111

runs great, no AC output. won't stay started. replaced the control board, no change. now I'm eyeballing the voltage regulator. problem is, I can't find a replacement regulator anywhere online.

any ideas where I can find one?

part# 315-0604

please help,

thanks mark
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  #2  
Old 03-03-2013, 08:55 AM
rpmalerba rpmalerba is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

There are several threads here about units not staying running. My issue was the oil sensor was NG. After grounding the sensor wire the unit stayed running until I replaced the sensor.
Do you have a manual or service book? Someone will send you a link I'm sure. That's how I fixed mine along with advice from here.

I found one and they only want 900.00 for it.

Other wise they are out there. Here's one sold a while back.

"Onan Generator Voltage Regulator Transformer 315-0604 (#320718711900), US $389.89. Positive feedback rating, •:*¨¨*:•.Thank You!.•:*¨¨*:•.5 Stars•:*¨¨*:•."
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Old 03-03-2013, 08:58 AM
Kevin K Kevin K is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

Not terribly hard to find one:
http://www.m-and-d.com/ONA-315-0604.html

But it costs more than the generator is worth in running condition.

Before you go throwing more money at it, you may want to consider getting the service and parts manuals and following the troubleshooting charts.
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Old 03-03-2013, 09:24 AM
Kpack Kpack is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

Post a email we,ll get some manuals and these guys will help you .
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Old 03-03-2013, 10:00 AM
vwmark68 vwmark68 is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

thanks for the replays.

my email is: vwmark@comcast.net

I did use the search engine and did read up on similar issue. it always seemed to come down to the low oil sensor or voltage regulator.

I got the unit for free, so I'm not opposed to spending a little bit on parts, but I'm shocked to hear that a transformer would cost over $400.

I'll definitely follow the trouble shooting guide, but is it highly unlikely that the transformer is the culprit?

I'll follow up with my results

thanks mark

I just saw the link from Kevin K

$843.00! wow, now thats expensive!

there are a few similar onans' for sale around here for that much, that already work. perhaps I should consider a different unit.
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Old 03-03-2013, 10:20 AM
rpmalerba rpmalerba is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

On my 6.3 I grounded the oil sensor wire to the frame and it ran constant. Then I took 12volts off the battery and touched one of the brushes in the back end part under the black plastic cover on the gen and it produced power. I then replaced the regulator as that's what applies 12volts to the brushes on start up.
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Old 03-03-2013, 11:04 AM
vwmark68 vwmark68 is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

I was just looking at flight systems online manuals and it seems that the cheaper items to check with a replacement would be the oil sensor. that being said, where do I find one of those? FS doesn't carry them, neither does ASAP.

any suggestions? I see some on ebay, but I can't tell which one works with mine.
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Old 03-03-2013, 12:47 PM
len k len k is online now
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

To help you better please post the full model number, so we can know exactly what have.

The control board will shut engine down when you release start switch if :
-- it's not making AC
-- oil pressure switch says presure is not up
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Old 03-03-2013, 12:55 PM
vwmark68 vwmark68 is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

sorry, here's the full model number

6.5NHE-1R/26100A

hopefully its the oil pressure sensor

thanks mark
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  #10  
Old 03-03-2013, 01:57 PM
Max Thompson Max Thompson is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

I just spent more hours than I care to admit tracking down a “Starts, but dies when switch is released” on the same unit you are working on.

Before you start throwing expensive parts at it, download the flight systems trouble shooting manual for the unit, it is free.

I will send you the manuals when I finish this note.

You can disconnect the low oil switch & ground the lead for trouble shooting, & eliminate that possibility.

There are only so many things that will cause this condition, one of which is no voltage output, but several others that are fairly cheep to fix. I wound up replacing the wiring harness, one of the pins in the plug was not making contact with the control board.
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Old 03-03-2013, 02:05 PM
vwmark68 vwmark68 is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

fantastic,

thanks Max

its good to know it might not be the worst(most expensive) case scenario. let the trouble shooting begin


mark
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Old 03-03-2013, 02:30 PM
len k len k is online now
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

Transformers are usually pretty tough and don't die. Check the diode bridge that takes AC from the Q windings and rectifies it to DC for rotor. Also good idea to check for dirty slip rings, measure resistance brush to brush , I beleive it should be around 12ohms (10 for rotor and ~2 for brushes). Have to remove wires going to diode bridge so you don't get false measurements.


Maybe someone else can help me with this one. I though the emerald 3 model was a newer version emerald that had the electronic regulator.
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Old 03-03-2013, 04:09 PM
rpmalerba rpmalerba is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

Quote:
Originally Posted by vwmark68 View Post
fantastic,

thanks Max

its good to know it might not be the worst(most expensive) case scenario. let the trouble shooting begin


mark
I posted twice that all you need to do is pull the oil sensor wire and ground it to the frame. If the unit stays running that's it, yet you haven't commented on that? Why wait for a part and spend money if a fast test gives you the answer?
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Old 03-03-2013, 04:42 PM
len k len k is online now
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Post Re: Onan 6.5 NHE transformer(voltage) regulator

Yes check oil issue first, start with the easy things

(I just assumed you would do that first)
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  #15  
Old 03-03-2013, 05:29 PM
vwmark68 vwmark68 is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

yes I will be checking the oil sensor 1st. I'm not near the generator today, so I'm just doing a preemptive struck and trying to locate parts I might need

thanks mark
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  #16  
Old 03-04-2013, 01:36 PM
len k len k is online now
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

If the transformer is bad there are other solutions. But first I have to ask why do you think it's the transformer?? I see it's dark, does it smell burnt?

Usually on the newer Emerald type design Onans it's the ELECTRONIC regulator that's bad. On these transformer regulator Emeralds check the diode bridge, maybe dirty slip rings.
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Old 03-04-2013, 04:05 PM
vwmark68 vwmark68 is offline
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

we pulled the transformer and it is totally burn up. I'm not sure what the previous owner did, but it is crispy. I'm hoping there is a suitable alternative to the $850 replacement. I see one on ebay that is very close(315-0652), but my electronic knowledge is limited. I have a friend who is pretty skilled at electronics and I was going to ask him. I don't want to do more damage by using the wrong part, I just can't believe there isn't a more reasonable option.

It seems like there would be good used ones floating around for sale, but I can't find anything on the internet. There are a couple of local RV places that I'm going to try to hit up

mark
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Old 03-04-2013, 04:23 PM
len k len k is online now
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

Some solutions are :
-- have the transformer rewound, they rewind rotors and stators, so someone should be able to do it. Although I have not heard of it.

-- substitute an aftermarket universal electronic regulator. Generally they take 120 or 240 volt power and energize the rotor. Don't know if Flight Systems makes them, also think Powertronics may make them. There are other manufactures, I don't remember their names, others here will know them.

Good idea to get reg that the flashes the field on every startup, like your control board is does, so don't have to issues with losing feild magnatism during storage.

Another issue...... you should also check your rotor and stator resistances.
Couple people from your area of USA had problems caused by fine desert sand.
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Old 03-04-2013, 05:54 PM
len k len k is online now
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Default Re: Onan 6.5 NHE transformer(voltage) regulator

Also, the very FIRST thing you should do is check that it is wired as per the schematic in the service manual. You never know what the previous owner did.
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