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The '71 Is Going Back Together!


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#31 chris m OFFLINE  

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Posted December 23, 2012 - 02:49 PM

If you have pulsing Dc while cranking, it should be sparking.
I would replace the condenser and grab another plug as my next two steps.

I bet your right. that condenser is prob bad.

#32 Ryan313 OFFLINE  

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Posted December 23, 2012 - 02:56 PM

I just replaced the condenser early this summer! Before I replaced the stair, it was sitting in the driveway. Every now and then I would start it to move it. I don't know why it would have went bad so suddenly?

#33 MH81 ONLINE  

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Posted December 23, 2012 - 03:01 PM

Is it possible the condenser lost hot connection or it's ground? That would be a problem also...

As for why they fail, it's a mystery. Water in it, somehow the plates moved away from each other, wire got twisted off inside... I had a hoodless tractor once that kept loosing the condensers. It ended up that water was wicking down the wire and getting inside. I mounted the condenser higher than the connection and the issue went away.

#34 Ryan313 OFFLINE  

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Posted December 23, 2012 - 03:04 PM

Is there a way to test the condenser?

#35 MH81 ONLINE  

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Posted December 23, 2012 - 06:12 PM

As far as I know, the best test is replacement.

  • chris m said thank you

#36 chris m OFFLINE  

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Posted December 23, 2012 - 06:15 PM

I know there is a way to test them but like Alan said I just replace them.

#37 MH81 ONLINE  

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Posted December 23, 2012 - 06:29 PM

Sorry Ryan, i didnt mean to be brief.

The only proper way to test a capacitve storage device is with a meter designed for that purpose. You have to also know what the correct value is. The good meters also do a leakage test.

You can (kinda) check a cap with an old fashioned analog meter on ohms, but it's not very accurate.

Set the meter to it's highest ohms setting, hook it up to the meter with the red lead on the wire and the black on the case. The meter should go up, then down. If it doesnt do either, it's either no connection (no up) or shorted (no down).
Now reverse the polarity of your leads... The needle will go further (not quite 2x as far, but for argument's sake...) and then back down.

This is not a test of value, but more a test of is it open/shorted and can it store a charge.

This will not work with a digital meter. The response time isn't fast enough to display what the analog meter will.

#38 Ryan313 OFFLINE  

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Posted December 23, 2012 - 06:36 PM

Ok, thanks for the info Alan! Looks like I have to wait longer to have my tractor back. :boo_hoo:

#39 chris m OFFLINE  

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Posted December 23, 2012 - 06:43 PM

Ryan did you pull the plug, and test for spark? or are you just thinking it has no spark because it didn't fire on ether?

#40 Ryan313 OFFLINE  

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Posted December 23, 2012 - 06:46 PM

Ryan did you pull the plug, and test for spark? or are you just thinking it has no spark because it didn't fire on ether?


I held onto the plug wire, I didn't feel anything?

Yes, I did pull the plug.

#41 chris m OFFLINE  

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Posted December 23, 2012 - 06:53 PM

That is strange. With you having power like you described, one would think you would be getting some kind of spark even if it was weak.

This K321 has an external coil (round) and condenser like a K301 right?

#42 Ryan313 OFFLINE  

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Posted December 23, 2012 - 06:55 PM

That is strange. With you having power like you described, one would think you would be getting some kind of spark even if it was weak.

This K321 has an external coil (round) and condenser like a K301 right?


Yes, round coil.

#43 chris m OFFLINE  

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Posted December 23, 2012 - 07:02 PM

For the heck of it. make a jumper wire (use alligator clips for quick removal) to go form the battery positive terminal to the + of the coil, Hook this up when you are ready to crank the engine over to test for spark.

When jumper is in place crank the engine over with the starter and check for spark.

This will at least determine if something is wrong coming from the switch.

Just don't leave the jumper on when not cranking it will burn the points.

#44 MH81 ONLINE  

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Posted December 23, 2012 - 07:07 PM

I agree you should feel something when you have it in your fingers. A bad condenser usually is endemic, invisible, but not " no" spark.

Are you going back out to the garage tonight?

If so, disconnect the wire that goes to the points and turn on the key. Then take a piece of wire from the ground terminal to the wire that would go to the points at the coil. (be sure you have the right terminal, we don't need that many sparks)

When you release the wire, you should get something.

#45 MH81 ONLINE  

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Posted December 23, 2012 - 07:09 PM

:rolling: Chris, we've got him working from both directions. Before long, he'll have 25' of zip cord all over the side of his tractor. :rolling:

You posted while I was typing. :D




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