It sounds like it was at some time converted from 6 to 12 volts and therefore has an external voltage dropping (12 to 6) series Ballast Resistor so that the old 6 volt coil could still be used. It would have one terminal to the Ignition switch and the other to the ignition coil i.e. its in series between the switch and old 6 volt coil, it drops 6 volts leaving 6 on the coil HOWEVER IF YOURE NOW BACK AT 6 VOLTS IT SHOULD NO LONGER BE USED, the wire from the ign switch would now wire direct to the coil... REMOVE THE BALLAST !!!!!!!!!!!!!
Next charging, welllllll if it was converetd from 6 (originally Pos ground) to 12 votls, someone may have also changed it to Negative ground. (Hows it wired now?? which battery post is to the tractors frame, Pos or neg ????) If thats the case the ammeter leads would have to have been swapped otherwise it would register bass ackwards i.e show charge when its really discharing but show discharge when its actually charging ????????????
If the ammeter is wired correctly if you turn lights or ignition on when shes setting not running it should swing over to - discharge,,,,if it swings to + charge its leads need swapped side to side so it will read correctly.
Regardless if the ammeter is wired right to see if its charging, the battery voltage should read around 6.3 volts just setting but when runnign at fast RPM it should raise to 6.5 to 7 or so DOES IT???????? If you have no voltmeter see if the lights get noticeably brighter as you go from slow idle to fast RPM, if so its charging !!!
far as the ammeter it may just be wired bass ackwards.
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