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Onan 12.5JC Sorting it Out


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  #71  
Old 02-24-2018, 02:00:20 PM
MBB MBB is offline
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Default Re: Onan 12.5JC Sorting it Out

You will need the 6V relay and the base (socket)
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  #72  
Old 02-24-2018, 02:04:40 PM
consolenut consolenut is offline
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Default Re: Onan 12.5JC Sorting it Out

That's what I thought! Thanks again. The blue wire works...but its a pain in the butt to take that wire on and off. And I want it to function correctly.
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  #73  
Old 02-24-2018, 04:27:17 PM
consolenut consolenut is offline
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Default Re: Onan 12.5JC Sorting it Out

Why did they use a 6V relay in a 12 volt systen. Just thought about that?
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  #74  
Old 02-24-2018, 05:07:31 PM
Max Thompson Max Thompson is offline
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Default Re: Onan 12.5JC Sorting it Out

Have not heard a "defiant" answer to that question yet.

I have made the assumption that it was used to facilitate "grounding it out" to shut the set down.
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  #75  
Old 02-24-2018, 05:18:14 PM
consolenut consolenut is offline
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Default Re: Onan 12.5JC Sorting it Out

Ahh okay....I wasn't doubting you max. Onan parts replacement is 6V too.. I am just understanding why.


No offense not at all. Just getting an understanding for the way it works.

I like to understand how a machine works or the idea behind the madness so to speak.
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  #76  
Old 03-24-2018, 04:05:55 PM
consolenut consolenut is offline
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Default Re: Onan 12.5JC Sorting it Out

Those look to be the original champion plugs installed at the factory. Weird part is they still fired okay. When I put new wires on it due to a few split boots. Figured plugs were in order. Replaced with NGK that was all O'Reillys had.
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  #77  
Old 03-24-2018, 04:38:19 PM
Leon N. Leon N. is offline
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Default Re: Onan 12.5JC Sorting it Out

My thinking on why Onan uses 6 volt relays in a 12 volt DC system is to limit inductive kick when the relay is de-energized thus prolonging the life of the switch contacts.
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  #78  
Old 03-24-2018, 04:38:55 PM
zuhnc zuhnc is offline
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Default Re: Onan 12.5JC Sorting it Out

R11 drops 6 volts, and K12 the other 6 volts on the 12 volt system. Operating the stop switch shorts K12, thereby de-energizing it, and R11 prevents a dead short through the centrifugal switch. The short time R11 is flowing current, until the centrifugal switch opens, causes no harm. Lots of stuff in some of these controls that depend upon something else operating properly to work correctly. Have to have the correct diagram for the unit you are working on, to make some sense of it. zuhnc
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