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Warheadrevo 01-07-2019 03:54 PM

816 No Spark
 
So I recently bought a 816 with the Onan 16.5 twin and I cleaned the points but I still have no spark. And all safety switches are bypassed. Any ideas? I looked up a new coil but that's really pricey was hoping there were some other common problems I could try first.

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Jack/modelA1 01-07-2019 11:22 PM

Re: 816 No Spark
 
Check continuity through key switch to coil. Replace the condenser. Check (-) wire to points , connection could be grounding out before points.

tracktortag 01-08-2019 12:00 PM

Re: 816 No Spark
 
In addition to above, using a light tester, do you have static power at the points with the ignition in the "on" position? If so, you may want to check the points gap to be sure they are gapped at .020 when open all of the way.

Warheadrevo 01-08-2019 12:08 PM

Re: 816 No Spark
 
Ya there's power at the bolt the wire hooks to all the time with the key on. I did buy a new condenser to try today also. So the points may need to be gapped?

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Bill Kapaun 01-08-2019 12:35 PM

Re: 816 No Spark
 
Rotate the engine so the points are closed.
With ignition ON, manually open the points. You should get a spark each time they open.
IF you don't, disconnect the condenser & repeat. IF spark, bad condener.

The ignition side of the coil should have 12V whenever the key is on.
The points side should only have 12V when the points are open. The points are simply a switch to ground/unground the coil.

Warheadrevo 01-08-2019 01:33 PM

Re: 816 No Spark
 
1 Attachment(s)
How do you know which side is the ignition side? Both of the bolts on the top have power all the time with the key on.

Attachment 2355849

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Warheadrevo 01-08-2019 01:37 PM

Re: 816 No Spark
 
And there's only 1 wire going to the points box is that right?

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Bill Kapaun 01-08-2019 02:15 PM

Re: 816 No Spark
 
Quote:

Originally Posted by Warheadrevo (Post 12183225)
How do you know which side is the ignition side? Both of the bolts on the top have power all the time with the key on......

That would mean the points aren't completing the circuit to ground.

You can use a jumper wire to the points side of the coil.
Ground it. When you "unground" it, you should get a spark if coil/condenser is good. That would confirm the points aren't completing the circuit.

Bill Kapaun 01-08-2019 03:10 PM

Re: 816 No Spark
 
Quote:

Originally Posted by Warheadrevo (Post 12183231)
And there's only 1 wire going to the points box is that right?

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The condenser will also be connected to the points.

Warheadrevo 01-08-2019 03:13 PM

Re: 816 No Spark
 
1 Attachment(s)
Yes the condenser is in the box with the points. But there's only 1 wire coming to the box from outside. Is that right?


Attachment 2355861

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tracktortag 01-08-2019 07:54 PM

Re: 816 No Spark
 
[QUOTE=Warheadrevo;12183189] So the points may need to be gapped?

Yes, I would check to be sure that they are set to the correct gap. Adjusting the points will in effect adjust the timing of an engine. Too far out, and the engine won't start.

Using a .020 in feeler gauge, check the gap between the points with them at their maximum distance from each other. Their gap should be .020 in.

Just in case you don't know, slowly turn the engine flywheel while watching the points. You will see them open, and close as you turn the flywheel. When you see them just begin to move back toward each other stop turning the flywheel, and back it up just enough so that the points are again at their farthest distance from each other, then slide the feeler gauge between them. The feeler gauge should move snugly between them, but without any drag. Recheck the gap after tightening the adjustment screw.

And yes, one wire going into the points box, which is connected to one side of the points, along with the condenser wire.

Warheadrevo 01-09-2019 11:56 AM

Re: 816 No Spark
 
Is there an electronic ignition I can get to replace the points on the engine? I see videos on the Nova 2 electronic ignition for single cylinder engines. But sense both plugs fire at the same time wouldn't this work for the twin cylinder Onan?

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chrpmaster 01-09-2019 12:39 PM

Re: 816 No Spark
 
I had an the same Onan and I had the same problem. I had older spark plug wires that would pull up off the top of the plug just enough to lose contact. I was puzzling over it too and finally figured it out when i pulled the plugs to check them. It started right up since I had pushed down on the spark plug boot when I reinstalled everything. You may have already checked this but I thought I would throw this out there before you rebuilt everything

Warheadrevo 01-09-2019 12:41 PM

Re: 816 No Spark
 
Ya it has brand new plug wires and plugs. I have a few things I'm going to try today. But it would be nice to have an electronic ignition and not worry about the points and condenser anymore.

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MARK (LI) 01-09-2019 01:11 PM

Re: 816 No Spark
 
Quote:

Originally Posted by Warheadrevo (Post 12183775)
Is there an electronic ignition I can get to replace the points on the engine? I see videos on the Nova 2 electronic ignition for single cylinder engines. But sense both plugs fire at the same time wouldn't this work for the twin cylinder Onan?

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Got this from a website of a place that sells them in Dayton Ohio
The NOVA Module is suitable for 2 leg and 3 leg ignition coils in single cylinder engines. This module is not recommended for use on engines equipped with battery ignition or flywheels with multiple magnets.


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