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Discussion Starter · #1 ·
Hello folks,
Looking for some advice for troubleshooting an issue with my points/condenser box, that is mounted just below and between the dash and air filter drum.

I was tuning a new set of points. I took the protective box off by loosening the single top screw while the tractor was off. I used a long screwdriver to get back behind the air filter drum. Then I started it up to adjust the points by ear while the tractor was running. When it sounded good I shut it down and put the box back on.

After that, the tractor would not start back up. It would crank like crazy. Much faster than usual. But, it would not turn over. Both spark plugs had a spark, but it was weak. However, suspecting that it was still an electrical issue, I took the box back off the points/condenser and it started right up. This time I decided to replace the box while the tractor was running, and the long screwdriver was arcing electricity to the air filter drum like a spark plug.

So, I guess the screw or box is not insulating correctly, and is preventing proper engine turn over? How might I prevent this from happening? Do I need a new insulator gasket under the points/condenser plate?
 

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A couple things to check. Is the coil wire bare where it passes below the cover? Where the coil wire mounts to the points, do you have the wire mounted from the top or bottom of the screw? If mounted from the top, the crimp fitting may be shorting out on the box cover.
 

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I would agree that it sounds like the wire or connector is making contact with the cover. You may see a burnt or black mark on the wire, crimp connector, or points cover. That would show where it's grounding out.
 

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Ingersoll Dealer
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I think that petr is on track here, the wire from the coil - to the breaker points is likely pinched or has a bare spot where it enters the point box. Otherwise as stated I would look for any other wiring within the box that could be touching the cover. The gasket between the base and engine block is not the issue as the base plate has to be grounded in order for the points to get a good ground when they close.

Bob
 

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Discussion Starter · #5 ·
A couple things to check. Is the coil wire bare where it passes below the cover? Where the coil wire mounts to the points, do you have the wire mounted from the top or bottom of the screw? If mounted from the top, the crimp fitting may be shorting out on the box cover.
It was the crimp fitting. I guess over time, screwing the box in place had caused a dent that was putting the cover in contact with the crimp fitting. So, I put some electrical tape over that area. No more arcing. Thanks for the tip looking for black marks. They were there.
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I was having issues and it came down to the condenser shorting out inside the points cover. I pushed the inside top out a little above where the wire is to make a little dome. Have not had any trouble since.
 

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Onan Master, new and used parts.
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the 312-0246 condenser is mounted INSIDE the point box.

i like to use the 312-0256 condenser OUTSIDE the point box.,
mounted on the air cleaner support bracket.

thank you. boomer
 

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Discussion Starter · #12 ·
Boomer,
when I got the tractor it had the OUTSIDE condenser set up. I replaced it with an INSIDE condenser. The outside version bolted right to the engine block seemed a bit strange to me.
 
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