Trying to cross over a coil part number for NAPA Deere 720

I went to mother Deere yesterday to get a new coil for my Deere 720 gas. They pulled up the part number and it said discontinued. I was wanting to go to napa or an auto parts store and pick one up. Does anyone know what a napa part number would be? Should I get a 12 volt coil with or without internal resistor required? I have seen those silver/crome 40k output type. Would that work and again with or without internal resistor? Thanks

If its a regular 720 gas tractor, it used a 6 Volt Coil and the external series voltage dropping (12 to 6) Ballast Resistor.

Therefore the coil you need may be labeled "6 Volts" or "12 volts for use with external ballast resistor" or "12 volts requires external ballast resistor" etc the last 2 of which are in reality more like 6 volt coils since the ballast drops 6 leaving only 6 on the coil

If it were me Id keep it like original and use the ballast plus a 6 volt coil for improved cold weather starting (assumes the ballast starting by pass circuitry is in place and operative) . If you want to toss the ballast then you would have to use a full 12 volt rated (NO Ballast) coil and do some minor rewiring.

That 40,000 volt coil you mentioned given the same conditions wont fire at any higher voltage then stock set up, its just that it has the capacity, if required, to achieve higher voltage if necessary. Its more for a system with an elec switch and wider plug gaps etc where higher firing voltages are used. Depending on its internal resistance, if its much less then stock and you still use points, it could cause premature points burning and not yield any more performance whatsoever. Id stay with a stock 6 volt coil unless you wanna fully upgrade to an elec switch and a matched high voltage higher energy coil and run a wider plug gap which can improve starting and idling charactersistics somewhat but may still not add much if any at all HP

Got it???????

John T

What internal resister? There is no internal resistor in any coil.

Got it. Thanks a ton for your help. Got a church parade this weekend.

You know, its those coils Billy Bob and Bubba are always calling "internally ballasted" or the ones with that "internal resistor" tucked away and hidden somewhere inside lol lol

John T