A little 12 volt conversion help for 21 stud

T

Tim

Senior Member
I'm still working on the great little 21 stud in my '33. It's so close to driving I am completely obssessed with it. I have a stock generator and fan and it all spins freely. But the Genny is toast and it's merely there to keep the water pumps and fan going. I am making the car 12 volt. I know some guys have converted the generator for the '35-'36 style to a 12 volt set-up. My question is what parts do I need? Will I need to change the field coils in mine or can I use an early 60's Ford Falcon/Truck Generator and mount the pulley and mount to it? Sorry to ask so many questions but I am driven to get this one on the road.

Thank you in advance,

Tim
 
You can change out the field coils to 12 volt, check the part suppliers or your local
starter / alternator / generator shop. Check the commutator and the brushes at the same time.
You will need to get a 12 V voltage regulator + make all the necessary changes for lights, ignition (8-9 volts at the coil) etc, etc. This is one of the most asked about changes on this or any other old car forum.
Let me know if you need more info, I can send over the list of what needs to be changed.
 
As I stated in another thread, I used the field coils and barrel from a 57-59 Y block. Fits straight up to the early end plates and armature. Add a 12v reg and you're away.
 
Tim is referring to a '33 generator which is a three brush design where the third brush is the voltage regulator. The Funprojects electronic regulator looks stock and sits on top of the generator, the third brush is set to max and the new regulator takes over that job, either 6V or 12V pos or neg ground, your choice, get the reg that suits your needs. ..B.
 
Scotchbrite does do a good job to clean a commutator, but one should not shine up a com unless there is good reason, ie some roughness or pitting, but the normal purple/brown appearance is a sign of good brush contact. Silicone, the stuff that comes out of a tube, should never be used anywhere near a commutator as the fumes it gives off as it cures forms a coating on the com that gradually decreases the area of brush contact until a quick load will blow gobs of copper. Just some DC trivia that was kicking around......... ..B.
 
what kind of tool do i need to unscrew the field coils, robertson-bit?
on my 42 gen there is no nut holding the pulley although it as the slot for a woodruff-key, do i just pull/pry it off?
 
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