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Onan 4bgefa26100f no fire to plugs


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  #1  
Old 03-13-2017, 07:40:00 PM
MKF MKF is offline
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Default Onan 4bgefa26100f no fire to plugs

My Onan 4bgefa26100f sn e880121596 does not send 12 volts to the coil. I checked the wire it meters good. Does that mean that the PC board needs replaced? If so where would be the best place to buy one? By the way the generator has not been ran for at least 2 1/2 years I have only had the RV for a few months and had several other issues to fix.
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Mike
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  #2  
Old 03-13-2017, 08:16:29 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

I will look it up. But I believe that one has an ignition rotor. Between the engine and gensection. Easy to break and will kill the spark.
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Old 03-15-2017, 01:59:54 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Does anyone have an electronic copy of the service manual for the generator listed above that they could email to me? mkf@iag.net
Thank you
Mike
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Old 03-15-2017, 02:10:11 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Look for the Twinslan link on this site. 965-0528 is your manual.
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Old 03-15-2017, 02:40:47 PM
Kevin K Kevin K is offline
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Default Re: Onan 4bgefa26100f no fire to plugs

One of our members has arranged hosting for our collection of Onan manuals. You can download the manuals for your generator at the Twinslan site:

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

You have a Spec F 4BGE generator.

965-0128 Operator
965-0231 Parts
965-0528 Service
965-0628 Install

Download the 900-0186 RV Wiring Diagrams manual form the Twinslan site. Your wiring diagram should be 611-1180 on page 78. Check to see if it matches what you actually have.

If the trouble turns out to be in the control board, it can be easily repaired by anyone with electronic skills as long as it is not one of the potted versions. You can also send it to Flight Systems for repair, or purchase a new board from them. Flight Systems is a reputable company that does high quality work and is recommended by many of the members here.
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Old 03-15-2017, 02:45:45 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

I looked at schematic on your BGE spec F. Looks like you have points , not an electronic ignition. When checking for 12V at spark coil put a 12V test light from +terminal of coil to frame and crank engine.

Check wiring from control board to spark coil , but looking at schematic of control board Iim guessing coil + lead fell on frame and shorted diode CR3 in the control board. Other possibility is bad contacts in relay K4 or K3 in control board. If your handy you can get a 12V test light and probe on either side of it to see if it's live while cranking gen ( both sides should be live while cranking, other end of test light goes to frame).

Otherwise we recommend Flight Systems for a replacement board, they make good quality aftermarket parts. ~ $125
Here's a link to flight systems for BGE spec A-E, it may be the same but call them and tell them you want it for your spec F gen
http://www.flightsystems.com/p-ONAN-300-2784-2943.html
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Old 03-15-2017, 05:19:55 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

First I would like to thank everyone for all of your help!!!
Ordered the board should be here by Monday $127.5 out the door.
When it gets here I'll install it and see how it works.
This unit has been setting for a while I am guessing that I should remove the carburetor and and clean it out and replace gaskets, any recommendations on a rebuild kit? Or should I just leave it alone and see how it works?
Thanks Again
Mike
mkf@iag.net
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Old 03-15-2017, 05:56:18 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Since it sat for few years clean the genhead slip rings before running, to protect the $240 AC voltage reg ( VR1).

Carb....can try just running it. But on engines I pick up I always assume carb is dirty and gummed up so I just take carb apart to clean it before I even try to run it. It's not hard. I don't bother with rebuild kits. I just take carb apart and clean everything with gas and a toothbrush. And blow all the other passageways out with compressed air, I have 150 psi air.

If you take carb apart there should be 2 long jets in cast dip tube that holds bowl on. One is hiding behind a screw in disk cover.
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Old 03-20-2017, 07:23:25 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

The board came with an advertisement for a device called a slick stick made for cleaning the slip rings. Has anyone used one of these? Do they work as advertised? Or is there another procedure for cleaning them? Please see attached.
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Attached Files
File Type: pdf Slick Stick.pdf (453.8 KB, 15 views)
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Old 03-20-2017, 09:38:27 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Supposed to work, never tried it. I just use a strip of schotchbrite pad jabbed on a modified kitchen fork and tied with cotton string. Then hold it under the slip rings while running. The modification is I grind off each side tine of a 4 tine metal food fork.
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Old 03-20-2017, 09:49:35 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Quote:
Originally Posted by MKF View Post
The board came with an advertisement for a device called a slick stick made for cleaning the slip rings. Has anyone used one of these? Do they work as advertised? Or is there another procedure for cleaning them? Please see attached.
Thanks
Those work very well. Doesn't require allot of pressure. Just enough to polish the rings. Just be careful with rotating parts.A good rewind shop will also have them. Called a brush stone.
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Old 03-21-2017, 07:57:20 AM
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Default Re: Onan 4bgefa26100f no fire to plugs

So you do clean the slip rings while the generator is running? Do I need to turn the 120vac breaker off while I am cleaning the slip rings?
Thanks again for everyone's help!!!
Mike
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Old 03-21-2017, 01:07:44 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Turning off breakers won't de-energize the genhead. Voltage across the slip rings and brushes is 18-60 VDC and typically 36 VDC at no load. But to be safest I suppose you could unplug the AC voltage reg (VR1), then genhead will only make ~ 1-2 VAC out the 120 line from residual magnetism.

Not making 120V your control board will shut down engine when you release start button. I suppose you could unplug or disconnect power to coil so engine doesn't start and stress the plastic starter gear. (just let starter crank engine).

Or you could hot wire power to spark coil and fuel pump so engine runs and you don't have to keep starter turning and wearing starter gear. Some gen specs had 6V coils and/or gas pump, I forget which. Could put a volt meter on it while running/cranking to see if it's 6 or 12V.
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