Ignition tests schematics (large post)

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Ignition tests schematics (large post)

Postby birddog » Mon Jul 23, 2012 2:39 pm

The schematics that I’ve drawn, are I believe, the way the Cub is wired from what I see on my Cub and what's in the operators manual. It is set up as a 6 volt positive ground. If you want to test a Neg. ground system just reverse the leads on your meter. (test light doesn’t matter)

Don’t assume I’m correct. If I have something wrong or I should add a test let me know. Thanks to Landreo and Eugene for expressing their interest in a schematic version and for their input. And as before, per brichters request, I tried to keep it simple.

These tests shown here are for a no spark scenario with a distributor ignition. I assume that if you know you have no spark that you do have battery voltage. These tests should work on almost any similar engines, including single cylinder. The sequence may differ slightly and some may not be needed depending on how the unit is wired. Also remember, each Test diagnosis is based on having passed the previous test. Make sure you always have a good connection with the meter or the test light.

The Pos. of the meter or one side of a test light goes to the Pos. (+) post of the battery or to a good ground, for all the tests shown here. For all of these tests a volt - ohm meter or a test light will work.

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If after the tests you can’t find the problem, then the condenser or the coil is bad. I believe how to check these may be in the “HOW TO FORUM”
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Re: Ignition tests schematics (large post)

Postby Rudi » Mon Jul 23, 2012 9:42 pm

Mark:

That is simply awesome :!: :D
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Re: Ignition tests schematics (large post)

Postby birddog » Tue Jul 24, 2012 5:36 pm

Thanks Rudi; It hasn't been getting to many views and with no comments I thought it may not be what folks wanted or no one even cared.

I have the schematics for the charging system almost done, so they will be coming shortly. I also have a test stand/ mock up pretty much done. I haven't decided yet though if I'll do the photo thing yet like I did with the Ignition system. (probably though if folks want it)
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Re: Ignition tests schematics (large post)

Postby Bus Driver » Tue Jul 24, 2012 5:42 pm

It represents lots of thought and work. And for the novice working on Cubs, it offers an ability to diagnose if one follows the material carefully. Good job.
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Re: Ignition tests schematics (large post)

Postby Rudi » Tue Jul 24, 2012 7:30 pm

Mark:

If you would do the charging tests and test stand as well complete with pics that would be priceless and as Bus Driver said, it sure would help the new members/novices. This is good stuff, lots of work and yeah I have an idea just how much work, but in the end it will be an invaluable addition to the resources in this community. BZ my friend ... top flight really top flight :D

So while you may not get a lot of comments or views right off, have no fear, it will happen and yeah.... we care :!:
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Re: Ignition tests schematics (large post)

Postby Mr E » Tue Jul 24, 2012 7:46 pm

Thanks, Mark. We appreciate your hard work.
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Re: Ignition tests schematics (large post)

Postby Tezell » Tue Jul 24, 2012 8:05 pm

I think even I could follow that.

Excellent job Mark.
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Re: Ignition tests schematics (large post)

Postby tractordad » Tue Jul 24, 2012 8:07 pm

Wow, this is great. Thanks for the effort. I know I will put this to use.
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Re: Ignition tests schematics (large post)

Postby Dale Finch » Wed Jul 25, 2012 9:32 am

WOW! What a spectacular production! Thank you SO much. I procrastinated even opening this, because I knew I would want to print it off and add it to my How To file, but wasn't at my printer. As a (former) EE person, I appreciate all the work you did, and know it will be put to good use.

Thank you again!! :big smile:
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