Author Topic: Onan emerald plus 4000 BGE spec G  (Read 151 times)

Offline Detached Dad

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  • Posts: 19
  • Member since: 2018
  • I own: a Motor Home
  • Year: 1984
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Onan emerald plus 4000 BGE spec G
« on: July 09, 2018, 08:51 PM »
where to get coil? Part #? Motor turns but no spark. Has oil so I thought I’d change coil.

Offline turbinebronze

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  • Posts: 61
  • Member since: 2015
  • I own: a Motor Home
  • Year: 1969
  • Make: Travco
  • Model: Mahal
  • Chassis: Dodge M-375
  • Engine: 318-3
Re: Onan emerald plus 4000 BGE spec G
« Reply #1 on: July 10, 2018, 11:59 AM »
Hi Dad,
  I'd check to see if the coil has power to it before changing it. I don't know how far you've got into this, I just hate seeing people changing parts without checking things out first.
  The coil should have power to it. If it has power to it, have someone turn it over and check the power on the neg side. It should flash. The trigger (be it electronic or points) should make a test light flash on the neg side. If it does that, then I'd look to changing the coil. If the neg side doesn't change while spinning, I'd say the coil could be good, and the trigger (points or electronic box) is not working.
  There's more to it than this, but that would be a start with a test light...
  Just my 2 cents, Craig.

Offline Detached Dad

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  • Posts: 19
  • Member since: 2018
  • I own: a Motor Home
  • Year: 1984
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: Onan emerald plus 4000 BGE spec G
« Reply #2 on: July 10, 2018, 06:52 PM »
I get light from both post.

Offline Detached Dad

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  • Posts: 19
  • Member since: 2018
  • I own: a Motor Home
  • Year: 1984
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: Onan emerald plus 4000 BGE spec G
« Reply #3 on: July 10, 2018, 06:57 PM »
 So if the negative side lights up that means the coil is bad ?

Offline turbinebronze

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  • Posts: 61
  • Member since: 2015
  • I own: a Motor Home
  • Year: 1969
  • Make: Travco
  • Model: Mahal
  • Chassis: Dodge M-375
  • Engine: 318-3
Re: Onan emerald plus 4000 BGE spec G
« Reply #4 on: July 11, 2018, 07:08 AM »
Well, could be...there are 2 different windings in a coil. There is a primary and a secondary winding. A light on both sides would tell me the primary winding is good.
  You have power to the coil, good. A light on each side also means that the switch is open on the neg side. The switch could be a set of points or an electronic control box.  If you spin the engine over, the neg side should turn on and off, like someone is turning a light switch on and off. You should see that with a test light on the neg.
  Remember, this is just a quick check. There are resistance readings for the coil that would be done with an ohm meter. We are just looking for a quick assessment of the system.
  If you google an drawing of a ignition system, I think you would understand troubleshooting it better. (Please don't take that last sentence wrong.)
  I would spin the engine with the test light on the neg side and see if it flashes. If it does, I'd look to replacing the coil or coil wire to the spark plug.
  Just my 2 cents, Craig.
   

Offline turbinebronze

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  • Posts: 61
  • Member since: 2015
  • I own: a Motor Home
  • Year: 1969
  • Make: Travco
  • Model: Mahal
  • Chassis: Dodge M-375
  • Engine: 318-3
Re: Onan emerald plus 4000 BGE spec G
« Reply #5 on: July 11, 2018, 07:31 AM »
Trying to post an Ign system...

Offline Rickf1985

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  • Year: 1989
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: Onan emerald plus 4000 BGE spec G
« Reply #6 on: July 11, 2018, 07:44 AM »
The fact that you have power in and out of the coil I would say it warrants checking the rest of the system. Coils are not cheap for these generators and you do not want to be throwing money away for nothing. If the negative side is not flashing or at least dimming a little as it cranks then I would say you have an ignition issue more than a coil issue. There are very comprehensive troubleshooting guides for these sets but you have to follow the step by step in the order given or you will never find the problem. I think you have to be a full member to see the generator manuals with the troubleshooting charts in them. You can go to the members area here and see if you can view the generator section. If not you can become a member for cheap or do a Google search for Onan master service manual. The troubleshooting guide is in there, along with anything you would ever want to know about Onan generators!

Offline tmsnyder

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  • Year: 1989
  • Make: Holiday Rambler
  • Model: 30' Aluma-Lite XL
  • Chassis: Chevy P-30
  • Engine: 454
Re: Onan emerald plus 4000 BGE spec G
« Reply #7 on: July 11, 2018, 08:30 AM »
flight systems .com has a great troubleshooting guide for Onan generators:


https://www.flightsystems.com/troubleshooting/


I highly recommend walking through their troubleshooting guide and making decisions based on that.   Also, their control boards work great and much less $ than OEM, I have one in mine.

 

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