Also I forgot to mention the IPL is missing the page that has the part number for the key switch. I was trying to see if the key switch part number was a magneto switch....

 

Alright, time to put my new literature to use! I have two July '73 IPLs - one for the 424/430/432 and one for the 424/430 that specifically calls out the engines as being Onan singles.

My Onan-specific 424/430 IPL shows 18272P1 for the key switch and has that same wiring diagram that you have.

I assume the other IPL must be for Kohler machines since it includes the 432, although it does not say. It does have the breakerless ignition shown in the wiring diagram, but has different wire colors and the 10713P2 "On-Off Ignition Switch" which would have been used with the 10885P1 starter button.

Those are old numbers so you'll have to convert, but the literature says you should have an 18272P1 in there. I don't know if it's actually right or not :hide:

 

John thanks, I put the part number in jacks small engines and it crosses to a stens magneto ignition switch

 

I think my thoughts are correct. This web site by a guy named Ed Stoller who lives two towns over from me seems to explain It well. I have been to his house before and he is "the mad scientist of ignitions." He has a whole lab with oscilloscopes, testing equipment Etc. He even has some hit and miss engines he put electronic ignitions on...

I think the DPO put the battery key switch in machine instead of the magneto switch. Hopefully they didn't short out the ignition module.... I hope to check it out tomorrow night ...

Here is the link to the page on Ed's site. It turns out Tecumseh also used a similar ignition module...

http://home.earthlink.net/~edstoller/id9.html

 

John is there a way for you to get those new manuals on Gravely Manuals .com ?

 

Yes, given time... I have hours and hours of scanning to do. It looks like the July '73 424/430/432 IPL is already on there from somebody else, but the July '73 424/430 IPL isn't there yet.

I can bump it to the top of my list... it's supposed to be cold for the next week or so, so I can probably get to it by next weekend at the latest.

 

This also explains why the guy had a ground wire to what is normally the solenoid wire. The magneto switch has a ground terminal where the s terminal is on the battery ignition switch. Wtf, lol. I have two magneto switches in my tool box. I should be able to put a spark plug in the thing and test the spark since the module should spark on its own without regard to any other wiring in the tractor...

 

Awesome. BTW I just went out in the dark and tested for spark and have nothing, lol. I will have to remove the flywheel and test the wiring to the stator. If all else fails I have another ignition I bought for $10 on ebay. I don't know if it works though. Worse case I will make a crank trigger with f150 parts like I did on my other 430....

 

I've never looked at the Onan single cylinder engines but don't they use the same basic timing gear cover? If so I would convert it using Onan P-series electronic ignition parts. Jason

 

Not sure about the timing gear cover... I can easily put a ford crankshaft position sensor in if needed.

 

Hey Guys,

I am trying to understand the correct wiring of the Onan NB ignition.

It appears it gets one wire with ac power from the stator, this wire connects to the terminal on the ignition module. The stator then has three wires that come out of it. Two go to the voltage regulator and the third is my question.

I believe the third wire goes to the key switch for a kill wire. Hence this would mean it needs a magneto ignition key switch, not a battery ignition key switch.

Can you guys confirm my logic is correct ?

The wiring diagram in the IPL for the 424/430 is hard to understand and I think it is really referencing the Kohler Breakerless ignition system. The Onan NB manual is also silent as to how it works.

Thanks,
Ralph

Here is the IPL diagram

View attachment 1108985

There are all manner of errors on that schematic. There are so many I don't know where to begin. If an engineer came to me with that drawing, I would take him outside and beat him with a stick.

Give me a day or so and I will come up with a good drawing.

 

In thinking about it some more, a new schematic is pointless. It is pretty obvious what needs to be connected to what despite the ambiguity and errors.

 

This site has been linked to several times and is a great source for ideas and parts.

http://gardentractorpullingtips.com/ignition.htm


Work your way down on the first page and they cover breaker less ignition systems, wiring and parts needed to make your own.

Al's video on repairing a breaker less ignition system,

Roger,

 

If you disconnect the 3 terminal connector, the engine should run. It won't charge, but it should run. It also won't stop.

Here is an updated schematic. black-white and white-black get connected together.

 

Hi Roger, thanks for the link to Brian's site and Al's video. I actually made Al's set up on my other 430.

For this one I was trying to get the factory set up to work.

 

So Richard, am I correct that the wire going from the trigger to the three pin connector on the stator is only for the purpose of shorting out the module to kill the ignition ? The other two legs of the three leg connector feed the voltage regulator ?

Thanks,

Ralph

 

After talking to the ignition expert Ed Stoller he said the stator actual makes some voltage that has to feed the ignition module. The module is a CDI capacitance discharge ignition. He suggested I test the lead coming from the stator for voltage while cranking the engine over . I haven't had time to test it as it is outside under the snow now

Anyways Old Tecumseh motors used almost the same trigger module . Ed thinks they may have the same stator also.

Thanks for the scan and I will keep you guys posted when the snow melts.

Ralph

 

Here is a pic of the Tecumseh module