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8N won't start


 
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Swede in IOWA
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PostPosted: Wed Dec 26, 2012 1:07 pm    Post subject: 8N won't start Reply to specific post Reply with quote

Fella drug a 49 8N front mount over to me. Says can you make it start and run. He "converted " it to 12v neg ground, and installed some kind of electronic ignition.Gets weak spark at plugs . He has 2 resistors in series in the wire feeding the coil.Does not seem right to me but I am not familiar with these electronic ignition deals.Getting 3 + volts on coil wire at coil. Do these resistors need to be in the circuit? Thanks Swede
 
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Bruce (VA)
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PostPosted: Wed Dec 26, 2012 1:11 pm    Post subject: Re: 8N won't start Reply to specific post Reply with quote

" Do these resistors need to be in the circuit? "

Probably not.

But until you can tell us the model of the EI unit & the value of the resistors, the chances are very good that just bypassing the resistors will let the smoke out of the EI.

Or, simply adopt the 'no guts, no glory' attitude & bypass the resistors. It will probably start & run fine. If it's still running fine 3 months from now, it clearly did not need the resistors.
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JMOR
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PostPosted: Wed Dec 26, 2012 1:34 pm    Post subject: Re: 8N won't start Reply to specific post Reply with quote

Swede in IOWA wrote:
(quoted from post at 17:07:24 12/26/12) Fella drug a 49 8N front mount over to me. Says can you make it start and run. He "converted " it to 12v neg ground, and installed some kind of electronic ignition.Gets weak spark at plugs . He has 2 resistors in series in the wire feeding the coil.Does not seem right to me but I am not familiar with these electronic ignition deals.Getting 3 + volts on coil wire at coil. Do these resistors need to be in the circuit? Thanks Swede
Need to know if 6v or 12v coil (about 1 Ohm primary on 6v and about 2 1/2 Ohm on 12v). When you say 3 volts on coil wire, if you mean on the HV coil terminal, then that is not real meaningful. If you mean on the screw on top of coil, then the conditions under which you measured it is essential information. How many Ohms is the extra resistor & is the other resistor the stock (12250) resistor?
 
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jackinok
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PostPosted: Wed Dec 26, 2012 1:54 pm    Post subject: Re: 8N won't start Reply to specific post Reply with quote

If i were GUESSING i would bypass one of the resistors. but that would be a guess without knowing all the particulars like bruce says. I would ask the fellow if it ran after he installed the electronic ignition/when the problem started etc. I have a old ferguson fifty to rewire,for a neighbor .he converted it to a alternator and was running it, when a wire started smoking. instead of pulling the battery cable off he just yanked all the wires out.if he werent a friend of my son i wouldnt mess with it.
 
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russb wa
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PostPosted: Wed Dec 26, 2012 3:23 pm    Post subject: Re: 8N won't start Reply to specific post Reply with quote

With the ignition off probe both ends of the last resistor and see if you can determine the resistance in Ohms.

Then you can try a resistor with less resistance. A good experiment might be to get a variable resistor aka potentiometer of enough capacity and try starting. Work down from higher to lesser resistance. More resistance = less or no spark, not enough resistance = release the magic smoke. They have magic smoke inside. If it gets away they quit working.
 
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russb wa
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PostPosted: Wed Dec 26, 2012 3:24 pm    Post subject: Re: 8N won't start Reply to specific post Reply with quote

Use your VOM Volt Ohm Meter, to probe both ends of the resistor.
 
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Swede in IOWA
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PostPosted: Thu Dec 27, 2012 8:06 am    Post subject: Re: 8N won't start Reply to specific post Reply with quote

Thanks for the help Guys. I will do some checking on resistance and post back. Swede
 
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