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720 Pony Motor Question

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charlie

05-04-2003 08:57:29




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Is it possible to convert the 6 volt starter system on a 720D pony to a 12v system? The generator and battery are shot and I do not want to spend alot to replace them.

If I could use 12v system, I could replace it with a 12v generator and voltage regulator from a chrysler product that i have used on all my other tractors with great success.




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Clooney

05-04-2003 09:53:47




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 Re: 720 Pony Motor Question in reply to charlie, 05-04-2003 08:57:29  
Charlie, the pony starter will work good at 12 volts. The fuel gage won't, & the pony distributor won't take 12 volts for long at all before frying those E-X-P-E-N-S-I-V-E fragile coils.
~If you want to convert it to 12 volts you will have to fool around with resistors to get the pony coils to start at around 5 volts & run at no more than 5 volts [probably more like 4.5 volts. The problem you will face is getting both coils to have the correct voltage when either one or both are in operation as that will effect the total circuit resistance. It will probably require a separate resistor for each coil, then a way to by-pass to a little higher voltage during cranking. Solid state voltage regulators would probably work if you could find some that would hold 5 volts constant with about a 4 amp rating. [one for each coil]
~You could always use some late GM electronic ignition [lost spark] coils, but the cost & mounting complexity wouldn't be worth the trouble & would cost more than repairing what you have.
~It's not as easy a gas tractor to convert because of those wimpy pony coils. But it can & has been done.....

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