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John Deere Tractors Discussion Forum
Show Parts for Model:

Re: Going to negative ground on 620

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Fixerupper

01-24-2013 18:49:52
100.42.82.30



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I agree with Buick all the way unless you plan on pulling an implememt that requires a lot of juice. The only time I saw a 620 changed to an alternator that really needed one was when the farmer bought a new White planter that had an electric drive of some sort, that he planned to pull with his 620. Jim




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RMOMN

01-24-2013 19:15:22
70.97.243.96



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 Re: Going to negative ground on 620 in reply to Fixerupper, 01-24-2013 18:49:52  
I just bought the tractor to use and that was already done.



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Fixerupper

01-24-2013 20:20:25
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 Re: Going to negative ground on 620 in reply to RMOMN, 01-24-2013 19:15:22  
OK, so now you have to work with the hand you're dealt. Like what was said, the ammeter wiring needs to be reversed, the primary wire on the coil changed so the negative side goes to the points. I've had good luck with generators on two bangers. The down side to a genny is the damage to your pocketbook when it comes time for replacement of the genny or regulator. Jim



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RMOMN

01-25-2013 06:18:47
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 Re: Going to negative ground on 620 in reply to Fixerupper, 01-24-2013 20:20:25  
Thanks Jim, I'm sure that's why it has a alt. on it. Now I have to figure out what needs to be done so I have working gauges. Bob



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Fixerupper

01-25-2013 08:31:33
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 Re: Going to negative ground on 620 in reply to RMOMN, 01-25-2013 06:18:47  
The only electric gauges are the fuel gauge and the ammeter. I'd be surprised if you DO have a working fuel gauge. Usually the sender gives up the ghost in those old girls. To check it out pull the top dash panel back a bit to get access to the back of the fuel gauge. It's held on by those four 5/16" cap screws that might or might or might not twist off. Find the wire that comes off the top of the fuel tank to the fuel gauge and ground the terminal it hooks to with the switch turned on. Just bump the grounding wire to the terminal in case you're touching the hot one. You should NOT have sparks at all. If you are getting power to the gauge and the gauge itself works and you are touching the right terminal it should peg full. If there's no reaction, run a jumper wire from a hot source to the power side of the gauge and try it again. When you first touch the jumper wire to the gauge just bump it to the gauge to see what happens in case there's a short somewhere that makes smoke. You'll figure it out. It's pretty straight forward. If the sender is bad they are available now in the reproduction market but I'll be darned if I remember where. Someone else might chime in. I got a repro sender and refurbished gauge for my 630 and it works fine. Jim

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RMOMN

01-25-2013 16:21:25
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 Re: Going to negative ground on 620 in reply to Fixerupper, 01-25-2013 08:31:33  
Thanks, Jim good info



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