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Onan 7.5 kw Ignition Problem


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  #21  
Old 03-31-2018, 09:21:45 PM
Steelhant Steelhant is offline
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Default Re: Onan 7.5 kw Ignition Problem

Still waiting on pointsaver, first time I ordered wrong, received an email that they were shipped,
I will let you know when I'm setup.

I did change the oil to 5-20 and cleaned everything up.

Thanks,
Chuck
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  #22  
Old 03-31-2018, 10:07:42 PM
zuhnc zuhnc is offline
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Default Re: Onan 7.5 kw Ignition Problem

Check for parasitic loads on your light load hunting issue. My 4.0CCK would hunt slightly when connected to my house. I discovered my waterbed heater cycles on and off once every few seconds to maintain temperature Back when I was working on generators for a living, our company rebuilt a small Onan for a radio relay tower site. We installed it, fired it up, and it started hunting like crazy. Governed perfectly in the shop under any load. Couldn't get it to settle down. Started turning off breakers, and after turning off the tower airplane warning light, the hunt went away. ON-OFF-ON-OFF... Drove us crazy for a few minutes. zuhnc
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  #23  
Old 04-03-2018, 04:47:13 PM
Steelhant Steelhant is offline
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Default Re: Onan 7.5 kw Ignition Problem "point saver update "

I received the point saver....but it will not work with my system..the coil has to be a least 3 ohms and mine is 1 ohm..I didn't check before hand, wasn't sure, my fault.. Trying to find out if I can change the coil.

Thanks,
Chuck
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  #24  
Old 04-03-2018, 05:57:14 PM
Kevin K Kevin K is offline
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Default Re: Onan 7.5 kw Ignition Problem

Looking back through the thread, the picture shows you have an older 6 volt coil. You must have an ignition resistor in the circuit for it to run on a 12 volt system. Typically 6 volt coils measure about 1.5 ohms, and 12 volt coils measure about 3 ohms. If you do replace the coil, replace it with a 12 volt coil and remove the ignition resistor.

There is a chance the Kirk point saver would work because you have the ignition resistor in the circuit to limit current and use a 6 volt coil on a 12 volt system. Unfortunately Kirk does not specify the maximum current draw, and the circuit is encapsulated in a metal can so we cannot check the component ratings.

A friend used a Velleman Transistor ignition kit on his 4BGE with the older ignition points, and it works well. The current limit on this kit is 4 amps. Because it is a kit, it would be easy to substitute a transistor with a higher current rating if necessary.

https://www.amazon.com/Velleman-K254.../dp/B007GP6EQ6
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  #25  
Old 04-04-2018, 10:50:50 PM
Steelhant Steelhant is offline
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Default Re: Onan 7.5 kw Ignition Problem

Thanks, that what I did today, I ordered the 12 volt coil from Kirk, he also explained how it will work, they are very helpful.
I will let you know when I'm up and running.

Thanks,
Chuck
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  #26  
Old 04-05-2018, 05:26:15 AM
Leon N. Leon N. is offline
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Default Re: Onan 7.5 kw Ignition Problem

Unless you really know what you are doing by modifying the original Onan JB design, and based upon my now some 48 years experience maintaining my JB, I would recommend staying with the genuine Onan JB configuration. Of course if you feel very confident in what you are proposing go for it. Good luck.
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  #27  
Old 04-13-2018, 07:39:39 PM
Steelhant Steelhant is offline
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Default Re: Onan 7.5 kw Ignition Problem update

Well I changed the coil with new wires and installed the point saver and to be honest, it stated right up, faster than before, running great. I guess time will tell.

Thanks for all your help.
Chuck
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  #28  
Old 04-13-2018, 09:37:14 PM
gchank gchank is offline
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Default Re: Onan 7.5 kw Ignition Problem

Anyway we can get some pictures of the installation for future reference and maybe it'll inspire me to upgrade the ignition on my JB thanks
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