First of all, the 4020 Gas or LP was 12 Volts (ONLY Diesels were 24 Volt) and far as I know (NO warranty) as long as they still used generators instead of alternators they were originally POS ground.
NOTE if you convert to Alternator most all are NEG Ground, so if the tractors was POS ground you need to reverse the polarity for NEG Ground. I hope the alternator wasn't damaged !!!!!!!!
The big main alternator charge wire output (for Neg ground tractor and alternator) would connect to the batterys POS post
To change from POS to NEG ground the coils wires would be swapped HOWEVER it will still fire even if incorrect polarity
If all else is well but theres no fire work through my Troubleshooting Procedure to find the problem, so often its simply the points
PS best I recall there was something else different on LP tractors but I forget what it was ???????? I still thought all were 12 Volts and as long as a generator was used still POS ground original MAYBE AN EXPERT CAN CONFIRM OR REBUT THAT ???????? When they went to alternators then it was NEG ground
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