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post #1 of 25 Old 01-07-2019, 03:54 PM Thread Starter
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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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post #2 of 25 Old 01-07-2019, 11:22 PM
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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.
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post #3 of 25 Old 01-08-2019, 12:00 PM
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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.


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post #4 of 25 Old 01-08-2019, 12:08 PM Thread Starter
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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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post #5 of 25 Old 01-08-2019, 12:35 PM
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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.

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post #6 of 25 Old 01-08-2019, 01:33 PM Thread Starter
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Re: 816 No Spark

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.

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post #7 of 25 Old 01-08-2019, 01:37 PM Thread Starter
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Re: 816 No Spark

And there's only 1 wire going to the points box is that right?

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post #8 of 25 Old 01-08-2019, 02:15 PM
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Re: 816 No Spark

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Originally Posted by Warheadrevo View Post
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.

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post #9 of 25 Old 01-08-2019, 03:10 PM
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Re: 816 No Spark

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Originally Posted by Warheadrevo View Post
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.

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post #10 of 25 Old 01-08-2019, 03:13 PM Thread Starter
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Re: 816 No Spark

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?


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post #11 of 25 Old 01-08-2019, 07:54 PM
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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.


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post #12 of 25 Old 01-09-2019, 11:56 AM Thread Starter
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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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post #13 of 25 Old 01-09-2019, 12:39 PM
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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

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post #14 of 25 Old 01-09-2019, 12:41 PM Thread Starter
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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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post #15 of 25 Old 01-09-2019, 01:11 PM
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Re: 816 No Spark

Quote:
Originally Posted by Warheadrevo View Post
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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