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Onan MME model 9mme a 1a - Help Needed


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  #21  
Old 08-13-2017, 09:20:44 AM
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Default Re: No ac input

Wayne, that was my youngest brother at around age 5. He's by the outlet with a knife and I'm thinking oh well he might as well learn about electricity. Zap! He gets up with eyes the size of silver dollars and I said spose you won't do that again. Mom yelled at me for the burned tip on the knife.
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  #22  
Old 08-13-2017, 09:51:31 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: No ac input

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Originally Posted by Wayne 440 View Post
Here is an illustration of one somewhat dated test method.
That is how I started out. You will clearly find out if you have power.

I think I know the one he is talking about.It was a short production unit. Two years,didn't last long. I will look but I don't think I have a manual on it.

People need to understand. Just saying I have an Onan. Is like saying I have a car. Where do you start trying to help.
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  #23  
Old 08-13-2017, 11:27:58 AM
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Default Re: No ac input

I managed to find the MME parts manual. I can see why he is confused. It list
A transformer
Two bridge rectifiers
A voltage suppressor
Three different resistors depending on spec.
One diode.

Not clear on what is used on what spec.

It is the one I was thinking of. A short lived production life.
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  #24  
Old 08-13-2017, 01:10:10 PM
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Default Re: No ac input

In post 3 of this newly merger thread oldgenny posts model and serial number, I'll assume his current question (post 8) is for that same gen.

------------------
Look on page 7-3 and 8-3 of service manual 918-0500. Schematic shows flashing diode comes off starter circuit, looks like after the field winding flashing current returns thru diode bridge, thru 120V neutral circuit, thru 120V neutral/ground bond, and finally to 12V ground ( frame). So it is important to have a 120V neutral to ground bond somewhere, or feild will not be energized (flashed with 12VDC ) to start the bootstrap process of starting to make AC.

Odd that Onan broke up the schematic into 2 sections. Engineers like to see it ALL in one schematic so they can get the big picture. Guess marketing or printers wanted it in 2 pieces

-----------------
Do you have the manual? If not use this link , then press control-F to bring up search. Type in MME you'll find the manuals. The service manual will be the most helpful one.

http://www.twinslan.net/~n0nas/manuals/onan/

Last edited by len k; 08-13-2017 at 01:27:08 PM.
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Old 08-13-2017, 01:34:14 PM
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Default Re: Onan MME model 9mme a 1a - Help Needed

when i was 4 years old, i touched the prongs on the plug of the extension cord i was plugging in, to see what would happen, no "TR" tamper resistant outlet that they now mandate, would have stopped that

another time a few years later, i used a butter knife to touch the nichrome wire heating element in the toaster, at that time i knew enough about electricity, not to go sticking things into outlets and such, BUT... i didn't know that nichrome wire wasn't insulated
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Old 08-13-2017, 01:50:38 PM
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Default Re: No ac input

it is an onan model 9 mme a 1a checked it myself while I was working on it. the serial no. is I870940696 i am a little mechanically and electrically inclined I don't just stare at the problem I test just like the shop manual says but it is hard to tell which terminals to test especially when all the wires are all white and the writings are small. I don't just stand there with my thumb up my nose I was a building engineer for 18 yrs before I retired and I have been an auto mechanic since I was 14 and that was many years ago. i am trying to download pictures to my lap top from my wifes cell phone.

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Originally Posted by oldgenny View Post
it is an onan model 9 mme a 1a checked it myself while I was working on it. the serial no. is I870940696 i am a little mechanically and electrically inclined I don't just stare at the problem I test just like the shop manual says but it is hard to tell which terminals to test especially when all the wires are all white and the writings are small. I don't just stand there with my thumb up my nose I was a building engineer for 18 yrs before I retired and I have been an auto mechanic since I was 14 and that was many years ago. i am trying to download pictures to my lap top from my wifes cell phone.
i have the shop manual i would just like to know who put all the wires the same color

yes and it is a 9mme a 1a
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Old 08-13-2017, 02:31:14 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: Onan MME model 9mme a 1a - Help Needed

Look on page 8-3 in this manual for output wiring like Len mentioned.:

http://www.twinslan.net/~n0nas/manua...0(06-1990).pdf


Onan made all the wires white. I'm old and I have a very hard time reading the wires, I have to clean them carefully as to not remove the markings, get a flashlight and a magnafying glass and decipher the letters/numbers.

Or please post a picture of what you are asking about!

Last edited by nothingbutdarts; 08-13-2017 at 02:32:35 PM. Reason: added info.
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  #28  
Old 08-13-2017, 04:36:12 PM
len k len k is offline
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Default Re: Onan MME model 9mme a 1a - Help Needed

Wires have faint numbers near the connectors.

Before I knew that, I just traced all the wires to see where they went , it's a small gen. Heck in a 20 car commercial garge I traced and numbered all wires in conduits to see how some nut job had modified the building wiring.

( to get more amps for an outlet they paralleled TWO SEPARATE 20 amp branch circuits to run an air compressor. And circuit went on to power ceiling florescent lights, small gauge ballast wires....40 amps

Last edited by len k; 08-13-2017 at 10:49:36 PM.
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Old 08-13-2017, 10:16:35 PM
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Default Re: Onan MME model 9mme a 1a - Help Needed

I found a new Genajunk unit one time. All blue wires no markings. Who ever wired it up knew what they were doing. Didn't help me standing on a hill top. With snow blowing around. I talked about everyone's mother at Genajunk.
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Old 08-14-2017, 09:05:30 PM
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Default Re: Onan MME model 9mme a 1a - Help Needed

I tried calling onan for the parts but there is none in stock in North America the only ones are in Belgium for 87 dollars each plus shipping and it doesn't come with a jar of lubricant. is there a substitute part I could use. I took the bridge rectifier off and there was no heat sink paste underneath so maybe it just overheated. I have pictures on the cell phone but I am not sure how to get them onto my laptop.
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