how do you polarize a generator

[JOB]

Years ago I welded on my truck with an AC buzz box and the generator no longer worked. I bought an old crawler tractor that the generator did not work. It was welded on with an AC buzz box. I know a guy with an old P&H welder (30's) vintage, that no longer works. He welded on the trailer frame with an AC buzz box. He hasn't a clue why it does not work. I knew another guy who gathered up several 12 volt Batteries and hooked them in series and touched two contacts in a generator welder to re-polarize it. What are those two contacts, and how do you know how much voltage to use? I know someone on here knows the answer, I don't. Thanks

 

[John T]

If you want to polarize a typical class a tractor generator once its installed and the Voltage Regulator (0r Cutout Relay) and battery is properly wired in, simply use a jumper wire etc to momentarily flash jump from the BAT terminal on the VR (0r cutout relay) over to the GEN/ARM terminal and you should get a small spark. Same thing if you momentarily flash jump from any hot ungrounded battery voltage source (like at the BAT terminal on the VR or Cutout Relay and other places) direct down to the Gennys ARM post.

Do that BEFORE start up. BOTH the Genny and VR need good frame grounds ya know.

For non charging issues, consult my Troubleshooting Procedure linked below.

Best wishes n God Bless yall

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=farmall&th=665110




John T
John Ts Troubleshooting

 

[JOB]

Thanks john, I knew someone would know. Do you know how to do a welding generator, and how much voltage to use?

 

[Puddles]

Here is how you flash a Lincoln SA-200.


Flashing the exciter field consists of passing current through the fields using an external source of 6 to 125 volts of DC power from a storage battery or DC generator. If using a DC generator, keep the generator turned off except when actually applying the flashing current. To flash the fields:

1. Turn the welder off. Raise one exciter brush off the commutator.
2. On Lincoln welders, attach the positive lead from the external DC source to the right hand brush holder.
3. Carefully holding an insulated section of the negative lead from the DC source, touch its lug or clamp to the left hand brush holder for five seconds. Pull it away quickly to minimize arcing.
Remove the lead from the right hand brush holder, replace the brush on the commutator, start the welder and the generator voltage should build up.

 

[JOB]

I would assume you would do all welding generators the same way. I was under the impression you needed a lot of DC volts to polarize a welding generator.
Thanks Puddles