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Can I replace my 6 volt genrator with a 12 volt?

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Andy BRadley

02-08-2002 15:50:26




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I have a 1956 420W with the original 6 volt positive ground system. My ammeter shows a discharge when the tractor is running and goes way down when I turn on the lights. I have tried polishing the generator armature with emery cloth with no results. I have also tried polarizing the generator with no results. I get a spark at the ARM post, but the generator does not turn. I have a brand new 12 volt generator that I was wondering if I could just swap in or will it hurt the system? What is causing the generator not to turn or produce any voltage? Thanks for your help...

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Clooney

02-09-2002 07:23:20




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 Re: Can I replace my 6 volt genrator with a 12 volt? in reply to Andy BRadley, 02-08-2002 15:50:26  
Andy, I have used 6 volt generators in 12 volt applications but never a 12 for a 6.
~The generator really doesn't care what voltage it puts out as long as it can develop enough amperage to maintain the required voltage & a 12 volt generator should be able to easily do that.
~The problems that could arise are the windings are heavier in a 6 volt generator to carry the higher amps & there is the risk of early burn-out if the generator is asked to maintain max output for long. And because the 12 volt generator will want to produce way more than 6 volts (actually about 7.5) the field points in the regulator will be very active trying to keep the voltage down to the required 7.5 volt level, that could be terminal for your regulator field points.
~As for your old original generator not working, if the field coils aren't open or shorted to the frame, the brushes are clean, making good contact & not shorted, the generator has a good ground, the commutator is clean & the brushes are making good contact with it you are pretty well left with a bad armature & you will need a growler to test it. (but you can do a quick test with an ohm meter to see if any of the segments are shorted to the shaft, if so the armature is n/g)

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Tony630

02-08-2002 16:43:01




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 Re: Can I replace my 6 volt genrator with a 12 volt? in reply to Andy BRadley, 02-08-2002 15:50:26  
1-More than likely you need/should replace your 6 volt regulator then polarize the regulator. But before I would waste the money and burn up a new regulator, I would take the generator to a real good rebuilder and have him run it on the machine and make sure you don't have a short in your armature.

2-If you want to change over to a 12 volt system it will take just a few minor changes.

First and foremost what is the polarity of the 12v generator? Do NOT connect battery until completed the following.

If positive ground get a 12v battery and ground appropriately. Add a resistor inline between feed wire to coil so as not to burn points up. Don't forget you probably have 6 volt lights. Change lights. Install wires on generator appropriately and connect negative battery cable. Done.

Second if you should have a negative ground generator you need to make the following changes. First, Again connect battery LAST. 12 volt battery to be grounded negatively. Swap the wires on your ammeter (or the gauge will read discharge when actually charging). Install resistor inline between feed wire and coil (again for the points). Swap wires on the coil; positive feed, negative to points/distributor. Install wires on generator appropriately and connect positive battery cable. Don't forget you probably have 6 volt lights. Change lights.

Starter is not required to be changed or modified.

Any questions post back. Remember check and double check all wires. Don't hold me to it but either a group 22 or group 26 should fit in the battery box and then only you will know it is a 12 volt system. Sorry for the long post!

Tony

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