REGULATOR

~If it's an aftermarket regulator it [could] still probably work but on some the current limiting winding is wired to work at the ground polarity written on the regulator's cover.

~If it is a 4 wire Deere regulator [BAT], [Gen], [Fld],& [L] terminals, you should probably not use the [L] terminal. Your 630 didn't use an [L] wire as wired from the factory so just leave that [L] terminal open.

~To wire that regulator into your tractor, you need to wire it like follows..... .[BAT] terminal on the regulator wires to the NON battery side of the ammeter [was a white wire],,,[fld] terminal on the regulator wires to the [F] post on the generator,,,[Gen] terminal on the regulator wires to the [A] post on the generator. If the regulator has an [L] terminal leave it open.

~Seeing as your 630 should have a by-pass starting system using a 6 volt [type] coil & a ballast resistor, the ignition coil is polarity sensitive & on a negative ground system should be wired with the positive terminal towards the ballast resistor & the negative terminal towards the distributor...It might already have been changed that way when the tractor was converted to negative ground but you should probably check it to be sure. If it is wired as original with the positive terminal towards the distributor you might want to just make the tractor positive ground again, all that's required is to swap the battery cables so the positive battery post goes to ground then swap the wires on the ammeter side to side so the wire going to the ignition switch & regulator are on the opposite side & the battery feed wire & cigarette lighter wire are on the other, then polarize the generator per below. That way you will have an original system & the regulator won't give you any future problems..

~It sounds like you might be removing an alternator from that 630, if so you can easily leave it negative ground. Nobody will be able to tell unless they lift the seat cushion. Just verify the ignition coil is wired per the above.

~After that regulator is installed [& wired] on the generator [make SURE it has a good ground], you will have to polarize the generator.. To do that, make sure the battery is charged & installed in the system, then just momentarily jump battery voltage from the regulator's [BAT] terminal to the generator's [A] post {larger of the two posts} ,,you should see a spark, if so it is then polarized.

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The other thing you could do is switch the tractor back over to positive ground as she was from the factory. Many are switched to neg ground when a negative ground alternator is installed, but you obviously dont have that situation. All thats involved in changing polarity is to re install the battery reversed (i.e. change it pos to ground and neg to starter post etc),,,,, reverse the ammeter leads so she reads correctly,,,,, ,,, re polarize once all is connected by momentarily flash jumping a wire from the VR's BAT terminal over to its ARM (or GEN) terminal (should get a spark),,,,, ,,, and reverse the coil leads (if needed) if you have an external ballast resistor but dont swap them if its an internal ballsted coil, and youre good to go.

Is there any reason you cant or dont want to go back to positive ground now????? ? Does your ammeter read correctly now????? ? Do you have an external ballast resistor or a 12 volt internally ballsted coil???? Which coil terminal (+ or -) goes to the distributor now????

Sorry about all the questions, but their answers will help me guide you, so let me know and you can post back, or e mail me at [email protected] or call me at (8120 824-4608 and I will try my best to hep you.

To answer your question, NO theres no way on most full fledged 3 or 4 wire Voltage Regulators (Im not talkign aobut simple 2 wire cut out relays, many of them are indeed reversible by swapping terminals) to change them from pos to neg grnd.

Good Luck and God Bless

John T Nordhoff in Indiana

JOHN TO ANSWER YOUR QUESTIONS: 1-Is there any reason you cant or don't want to go back to positive ground now????? ? THERE IS NO REASON I CAN`T GO BACK TO A POSITIVE GROUND ARRANGEMENT. I WAS LOOKING AT THE WAY THE TRACTOR WAS SET UP NOW. IT COULD BE VERY EASILY SET UP FOR A POSITIVE GROUND. 2-Does your ammeter read correctly now????? ? YES MY AMP METER READS CORRECTLY.

3-Do you have an external ballast resistor or a 12 volt internally ballsted coil???? I HAVE A BALLAST RESISTOR BEFORE A 6 VOLT COIL WITH A JUMPER FROM THE START BUTTON TO THE BALLAST RESISTOR CONNECTER TO THE COIL, FOR A HOT START.

4-Which coil terminal (+ or -) goes to the distributor now???? THE ( - ) GOES TO THE DISTRIBUTOR NOW.
BILL LEWIS, PRATTSVILLE ARKANSAS

1 and 2) Since theres no problem in going back to Positive ground, if you want to use that Pos grnd Voltage Regulator, if it were mine I would just go to pos ground, then install the new pos grnd VR you have and polarize. Since the ammeter reads right now for neg ground however, its leads would have to be reversed to make it right for pos ground.

3 and 4) Since you have a 6 volt non internal ballasted coil, it needs to be wired + to distributor if you go to pos ground or - to coil if you stay with neg ground.

Thanks for the additional info, it helps us to answer your question or solve your problem.

Take Care and God Bless

John T Nordhoff

BILL LEWIS - PRATTSVILLE,ARKANSAS