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pony coils

J

johndeeregreg

Member
if a person was to put a negative ground alternator on a tractor with a pony does he need to switch the coil wires? as in move the wires on the condensers to the power terminal and the wires from the power terminal to the condensers.
 
No, it is a "wasted spark" ignition system and each coil already fires one sparkplug (-) and the other one (+).

Changing battery polarity will reverse that, between each pair of sparkplugs, but it doesn't matter.
 
I agree with Bob, he can correct me if I'm wrong, but as I understand it one end of the HV Secondary coil attaches to one plug and the other end of that same HV secondary to the other plug. The LV primary, of course, attaches one end to the battery via ign switch and other end goes through points to ground. Farmer Billy Bob used to burn points and coils by forgetting to turn the pony ignition off after the diesel started. I think many who use the new updated coils do away with the ignition ballast resistor also.

JOhn T
 

How are you going to prevent coil burn out when using an alternator?
Why the desire to use an alternator on a starting engine equipped two cylinder.
 
Alternators are usually 12 volts and pony electrical systems are 6 volt. Coils can't tolerate much more than 6 volts for any period of time. Need to protect them some how.
 
"<font color="#6699ff">[b:654c4848f0][i:654c4848f0]Coils can't tolerate much more than 6 volts for any period of time. Need to protect them some how.[/i:654c4848f0][/b:654c4848f0]</font>"

The previous owner of "John W" our 56 Model 70 diesel installed an ignition resistor.

a151635.jpg" width="650"


 
Like you I hope he was talking about a 6 volt alternator !!!

By the way, isn't there already a small ballast resistor that reduces the 6 battery volts to down around 4.5 for the pony coils??? Ive talked to some guys who when they buy the newer replacement pony coils they do away with that 6 to 4.5 ballast anyway.......

John T
 
If its still the original 6 volt system I thought they originally already had a small ballast resistor that dropped the 6 volts down to 4.5 for the pony coils??? Of course if converted to 12 volts then you reallyyyyyyyyyyyyy need to add more ballast

John T
 
John T...the way the 70 diesels are set up they 6 volts going to the coils when the starter is engaged and when the engine starts it's reduced down to about 4 volts through a wire resistor on the back on the ignition switch. When I rewire a 70 diesel I eliminate the resistor and give the coils a full 6 volts. If you should leave the ignition switch on for a long time w/o the engine running you'll burn them up at either 6 volts or 4 volts.
 
Thanks, that's the way I was thinking they were configured but it been a long time lol

John T
 
well the tractor was converted to 12 volt electric start before I got it and I put a pony back on it with a cobbled together 12 volt coil system. I came across a good distributor and was thinking about eliminating the cobbled coils and getting it closer to original. just don't want to buy a six volt battery and have to switch over everything else. yes I intend to use a resistor on the power wire to the distributor. I have a 3 ohm resistor which gets me down to 6. something volts I believe.
 

Depends on the current draw . 2 amps through a 3.0 ohm ballast will drop 6 volts. 4 amps through a 3.0 ohm, ballast will drop 12 volts.
Using two ballasts, one per coil ? Or one ballast supplying both coils ?
 
I have a 6 volt posi ground low rpm excite alt on my 720 diesel and run 6 volts to the coils have for over 5 years now and only burnt one coil in that time and guess why.....yeah I left the switch on
 
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