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Mornin AGR, I also own a 620 and love it. 1) It came from the factory as positive ground, but have no idea what you have now. Just look and see which battery terminal, pos or neg, is attached to the tractors frame or case or seat etc etc with a big battery cable and thats what you now have i.e pos grounded or neg grounded. If you have a 6 volt un ballasted coil, its polarity should match that of the tractor. If she starts n runs and charges fine and the ammeter indicates in the proper direction, your polarity and coil etc is probalby fine as is, regardless if pos or neg grounded. Post back what you find. 2) That oil thing on the sediement bowl isnt a pump, its a low oil presure safety fuel shut off system. (If yours is equipped with one, not just a regular sediment bowl) Theres a small presurized oil line hooked to it which tees into the oil pressure gauge, and if theres no oil pressure, it shuts off the gas so you dont trash the tractors engine by running with no oil pressure. They often go bad (leaky rubber diaphragm) causing oil to mix with gas which is a bad problem that needs immediate fixing. 3) Many 620's (about all Ive seen) did indeed have the ceramic voltage dropping current reducing ballast reswistor in series with the circuit leading from the ignition switch down to the coil. Its intended for using 6 volt coils on 12 volt battery systems and it drops approx 5 to 6 volts leaving the remaining 6 or 7 or more across the coil as it was designed for. If you run a 6 volt coil on a 12 volt system unballsted, the coil will run hot (eventually go bad) and the points will burn out prematurely. Most have the ballast by pass startign assist system which allows the coil to see full battery voltage ONLY when the start motor is engaged and then its back in the circuit to limit coil and points current and drop coil voltage. Its fed off a lil side terminal on the starter switch which is hot ONLY when the starter is engaged and is wired either to the high (non distributor) side of the coil or the low (non ignition switch) side of the ballast, the same electrical point. I forget which issue, but a while back I had published an entire article in Green Magazine on Ballast Resistor Systems, so e mail if you want a copy. Glad to hear of the purchase, post back any more questions, I can help some on electrical problems and a little bit on other systems. God Bless the USA John T Nordhoff in Indiana
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