changing super c to 12 volt.

I have a super c that was 6 volt and was charging on 6 volt. Decided that I wanted to change over to 12 volt still using the 6 volt generator. Bought a new 12 volt regulator and installed the new regulator same as 6 volt that was removed. Left the tractor wired positive ground, installed porcelain block to reduce voltage to coil, installed 12 volt battery. Polarized the new regulator. Now when I start the tractor amp gauge goes all the way to the discharge side and stays there for a while even after shutting tractor off. Eventually it comes back to center. Can bring it to the center with a magnet also.
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First of all, you don't polarize the regulator. If it was working on 6 volts, why botch it?

The ONLY reason to convert a C to 12 volts is that you can use an alternator, if you are tired of messing with generators. That tractor is one of the easiest starting 6 volt tractors there is. Related to your question, as far as I know you will not be successful using a 12 volt battery and a 6 volt generator, others may answer your question.

As other post said you dont polarize a reg is the reg made for pos gnd as you probably have torched it. If you still think you need 12v start with gen or an alt then rewire for the new system. As CNKS said there realy is no reason to go to 12v on a C. Just get the present system working they have been working for over 60 plus yrs and will still work.

I HAVE INDEED used a 6 volt genny coupled to a 12 volt Voltage Regulator and it worked okay to charge a 12 volt battery buttttttttttt before anyone has a calf now Im NOT saying its engineering correct, I'm ONLY saying it worked. A DC generator is more of a current device then a voltage device...

The engineering reason why is basically a genny dont necessarily know its output, such is increased EITHER by turning it faster orrrrrrr pumping more current through its field windings (the job of the Voltage Regulator control) which increases the magnetic field strength in which the armature is rotating thereby increasing its output.

BUTTTTTTT the problem is, the field windings have a certain max current rating and if thats ecceeded for too long a period they may overheat BUT MINE NEVER DID

Sooooooo it can work, my conversions all did no problem buttttttttt things have to be close to right which depends on the gennys field ratings anf if its a 2 or 3 brush etc and the VR performance and specs and the duty cycle and max current it tries to put in the fields etc etc etc so just cuz one particular genny with one VR works dont mean they all will BUT IT CAN WORK AND MINE DID

Hope this helps

John T Longggggggg retired Electrical Engineer

i chanced 6 to 12, but put an alterntor on. had to switch the wires on the amp meater to show charge.

Not for nothing, but you jury-rigged something that normally doesn't work. Incorrectly. You shouldn't be surprised that it didn't work.

The pegged needle sounds like you've got a dead short.