[b]8N Capacitor Questions[/b]

   / [b]8N Capacitor Questions[/b] #21  
Re: [b]8N Capacitor Questions[/b]

Dave, below is a quote from your earlier post:

He started having problems getting his Cub Low-Boy started and keeping it running. He called me the first time he had a problem starting it and after much diagnosis I determined that he had a bad capacitor. We replaced the capacitor and all was OK for a short time. When he had problems again I went back to look at the Cub and once again it looked like a bad capacitor and a replacement fixed the problem. He wound up buying capacitors by the box and when he had trouble with his Cub he would replace the capacitor. Sometimes he would only run for 50 feet and the tractor would quit. A capacitor replacement would fix it for a while. end quote:

Dave, from the above quote I concluded that the intermittent ignition switch (the basic problem) was knocking out the capacitor as well.
Sorry for the mis-understanding.

Soundguy is right on testing caps with an ohm meter.
You might want to re-test those capacitors the way he does it.
The cap absorbes then stores battery current sent from meter battery. Also, without discharging cap, same test done about an hour after the first will give some indication of well the cap holds it's electron charge. It should take no more current from meter. This test will give some indication of insulation quality between the cap plates.
Analog ohmeters are better then digital ones for this job.

cheers,
 
   / [b]8N Capacitor Questions[/b] #22  
Re: [b]8N Capacitor Questions[/b]

For me it was easier to buy a kit and switch to an electronic ignition.
 
   / [b]8N Capacitor Questions[/b] #23  
Re: [b]8N Capacitor Questions[/b]

Getting back to the 6V vs 8V vs 12V systems, for the life of me I can't figure out why someone has to convert or partially convert their potentially 6 volt 8N to a higher voltage if it's just to make it start better. The 6 volt starters are bulletproof and easily rebuilt to work like new. The generator can also be rebuilt and new spark plug wiring etc is an easy setup. For $120. you can have the whole electrical system rebuilt and it will last a lifetime.
I think what really goes bad in the starters is the bushings; they get hogged out of round, the armature starts turning non-concentrically and as it turns it shorts out against the case wiring, thus drawing too much parasitic current and there's less current available to turn the armature. So the starter won't spin fast enough, excess current draw drops the voltage to the coil and the plugs don't fire hot enough. Solution: get the starter rebuilt. Once you do this, the starter sounds like a car starter twirling around. Amazing!!
I guess if someone needed all kinds of auxilliary lights and accessories then a 12 volt alternator might do it, otherwise stick with 6 volts.
My 6 volt 8N starts any temp above -10F on the second crank.
Any colder and I'm inside by the fire.
simonmeridew
 
   / [b]8N Capacitor Questions[/b]
  • Thread Starter
#24  
Re: [b]8N Capacitor Questions[/b]

Keoke, Fredex, Soundguy, Dave Lilly, ToadHill & Simonmeridew: Thanks for all the input! Wow, this site never ceases to amaze me. What a wealth of knowledge and willingness by all of you to share it!!! It will take my son and I some time to soak all this in, and do some more investigation. Just a few comments on the current situation: The points have always looked good when we have had starting problems (no pitting). We have not added a ballast resistor. Battery is original positive ground. This is 2nd 8V battery in this tractor. No problems with 1st 8V. The battery is topped off with a Battery Minder. The tractor charging system has not been adjusted. The tractor has no lights so that has not been a problem. The generator is a 6V that has just been rebuilt (less than one hour running time). We will do some current mesurements and look at the coil polarity, although there was no question in our minds when we replaced it. The ignition switch is also new. Again, thanks for all the suggestions! I will try to update everyone as we learn more. /forums/images/graemlins/smile.gif /forums/images/graemlins/confused.gif /forums/images/graemlins/smile.gif Rusty
 

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