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Onan 6.5 MCCK Won't Run with the Release of Start Switch


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Old 10-06-2016, 03:54:00 PM
TreSea TreSea is offline
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Default Onan 6.5 MCCK Won't Run with the Release of Start Switch

Hi guys and girls.
I have an Onan 6.5 mcck spec H. I can't really read the model number. I think it is 6.5 mcck 3CPA2288H "ish". set H870 916919
It runs great, I've spent a lot of time tweaking it. Recently it won't stay running after release of the start switch. I've read the other threads but just can't figure it out. Here's what I've figured out. If I remove the rmt fuse it starts and run great, but the stop switch doesn't work. Then I put the fuse in and it shuts down. While running it generates good AC volts. There is no dc volts while running on the CRG fuse either side. Any thoughts?
Thanks in advance. Tony
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Old 10-06-2016, 04:30:21 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

There is a charge resistor on the generator end that keeps the DC voltage below a certain output.. when it.shorts or etc.. this happens.. there available on ebay or onan parts might have one...you'll have to look up the part number im.the manual for your unit.. as its been a year or so and I can't remember it
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Old 10-06-2016, 05:24:23 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

Resistor number is 353-0092. Common for it to go out about every ten years.
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Old 10-06-2016, 06:46:39 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

Thanks guys!! I think I found the problem with your help. I haven't opened the gen end up before. Looks like I have some work to do.
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Old 10-06-2016, 06:48:31 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

This is the one
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Old 10-06-2016, 07:00:29 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

Hey Billy, thanks again for spending your time helping us out!
Question, the parts manual lists two of them as 353-0091? 353-0092 is a 50w, 353-0091 is a 25 w. Your thoughts? Tony
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Old 10-06-2016, 07:05:13 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

I posted the wrong one. That one is 353-0091.
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Old 10-06-2016, 07:38:52 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

Awesome. Your the best!
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Old 10-17-2016, 02:29:44 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

Ok, so I've replaced both resistors 353-0091. I'm waiting on resistor 353-0068, it should be here today. But it still won't stay running after release of the start button.
On a separate problem, the electric choke. How is it powered? 12v, 110? My wires have been snipped and trying to find where to run them.
Third, I have 110v now at my crg fuse, was thinking it should be 12v?
Thanks Tony
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Old 10-17-2016, 05:26:35 PM
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Default Re: Onan 6.5 mcck wont run with the release of start switch

So, I hooked up the electric choke to 12v and nothing happens. Then I hooked it up to the wire from the CRG fuse with 110 and it glows hot like it is supposed to.
I still don't know why it won't run after releasing the start switch.
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