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No Spark - need help!

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lastcowboy32
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Joined: 20 May 2015
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PostPosted: Tue May 14, 2019 6:42 pm    Post subject: Re: No Spark - need help! Reply to specific post Reply with quote


That's a great question, Hobo.

Theoretically, a short in the coil or failed insulation would reduce the coil voltage...but man...that that would have to do one of a few things

Put those extra 2.84"bolts" across the ballast resistor

Or

Put those extra 2.84 volts across something else between the battery and coil, like wiring

Or

The battery voltage itself is dipping.

In the first two situations, something is going to pop soon, either the coil, or ballast resistor or the wiring is going to make like a fuse and pop.

In the last situation, your battery is questionable.

I would be curious what the battery voltage is, when points are closed and the coil is measuring so low.
 
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JMOR
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PostPosted: Tue May 14, 2019 7:38 pm    Post subject: Re: No Spark - need help! Reply to specific post Reply with quote

lastcowboy32 wrote:
(quoted from post at 22:42:59 05/14/19)
That's a great question, Hobo.

Theoretically, a short in the coil or failed insulation would reduce the coil voltage...but man...that that would have to do one of a few things

Put those extra 2.84"bolts" across the ballast resistor

Or

Put those extra 2.84 volts across something else between the battery and coil, like wiring

Or

The battery voltage itself is dipping.

In the first two situations, something is going to pop soon, either the coil, or ballast resistor or the wiring is going to make like a fuse and pop.

In the last situation, your battery is questionable.

I would be curious what the battery voltage is, when points are closed and the coil is measuring so low.
Hint: those voltage measurements mean little, since those coils over the years and over the vendors vary by 3 to one.
 
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lastcowboy32
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PostPosted: Wed May 15, 2019 4:29 am    Post subject: Re: No Spark - need help! Reply to specific post Reply with quote

Yikes

Nothing like quality control...
 
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Tony292
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PostPosted: Wed May 15, 2019 6:41 am    Post subject: Re: No Spark - need help! Reply to specific post Reply with quote


I highly recommend removing the distributor from the tractor and testing it. Here is a great YouTube video showing how to test it off the tractor. Very simple actually.

https://m.youtube.com/watch?v=p-vrSWFJzqQ
 
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cersbo
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PostPosted: Wed May 15, 2019 7:53 am    Post subject: Re: No Spark - need help! Reply to specific post Reply with quote

Thank you, I will.
 
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cersbo
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PostPosted: Fri May 17, 2019 1:35 pm    Post subject: Re: No Spark - need help! Reply to specific post Reply with quote

Bruce, upon removing the distributor in I discovered the problem. please see attached photo. Since I am not too mechanical what would be the absolute easiest fix? Thanks for any and all insight!

 
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Bruce (VA)
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PostPosted: Fri May 17, 2019 1:37 pm    Post subject: Re: No Spark - need help! Reply to specific post Reply with quote

Buy a new rotor and make sure you get the cap on correctly.
75 Tips

 
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