JD 630 grounding

[Navajo350]

Can someone tell me how to tell on a later style JD like a 20 or 30 series if it's positive or negative ground when the battery is missing? A guy was going to try to jump start a 630 I am interested in.

 

[Ben.So.Tex]

Positive Ground.. Some owner have change them from Generator to Alternator which make it a Negative Ground. Talk to the owner about any changes.

 

[tomstractorsandtoys]

If it still has a generator it should be positive ground. Also check the battery cables as pos and neg are different sizes. Tom

 

[John T]

ALLLLL Two Cylinder Deeres were originally POSITIVE GROUND, but many got converted over the years. HOWEVER the starter will still turn the same direction regardless.

If it has a standard alternator there's a good chance it got converted to NEG ground. If converted properly ??? the ignition coil leads and the ammeter leads would have been swapped, so those are clues that may help. If it still has a generator, while it still could have been converted, there's a good chance it's still the original POS ground. The + and - battery cable sizes are a bit different diameter which may also help solve the riddle.

If it still has a generator and if the coil and ammeter leads have NOT been swapped side to side, there's a good chance its still as original POS grounded.

It can still run at the incorrect polarity, but the ammeter would register bass ackwards, spark not as efficient, and you could risk harm to the Voltage Regulator if the Genny wasn't correctly polarized.

Hope this helps and answers your question, I'm sure I may have missed a few tips, which if so, hopefully others can add to this.

John T

 

[PJH]

Electrically speaking, the 630 is not going to be much different from the 530 that you asked about last week. There might be slight differences, but I can't offhand think of any.

It's good to ask before flashing something. It's always the most expensive part that goes up in smoke when I'm tinkering with something.
John Deere 530 Electrical

 

[Nortex]

Dumb question, but when using battery cables, from a neg ground vehicle, to jump a pos ground tractor, would you connect neg to pos and pos to neg? Ground to ground and hot to hot?

 

[John T]

A good question actually and an important one. Its always POS TO POS AND NEG TO NEG from one BATTERY to another. Don't get confused with which battery post Pos or Neg happens to be attached to a huge hunk of iron. Where you have to be careful is if one vehicle is Pos and the other is Neg and you use jumpers DO NOT let the frames come in contact. Just keep straight that the frame is connected to that vehicles battery post which may be its Pos (Pos ground) or may be its Neg (Neg ground).

John T

 

[buickanddeere]

(quoted from post at 19:34:51 07/07/17) Dumb question, but when using battery cables, from a neg ground vehicle, to jump a pos ground tractor, would you connect neg to pos and pos to neg? Ground to ground and hot to hot?

KAAAAAAAAA...........BOOOOOOOOMMMMMMMMM

pos to pos and neg to neg

 

[Nortex]

Thanks John, wasn't sure how to attach the cables from my pickup battery to the battery on my old A.