I receive many emails about starting problems with 6 volt cars.
Here is a standard reply that may be interesting to some members.
Some owners rip out the 6 volt stuff and install 12 volt system with
the
notion that 12 volt is better.
The 6 volt systems were fine when the cars were new and they started
fine.
Converting to 12 volts creates many headaches.

The 6 volt stater had a problem with the stator insulation swelling up
and when there is even the slightest wear on the bushings the armature
will touch the stator and that physical contact robs the power.
If you install new bushings in the starter it will normally solve the
problems
.
You can also look at the inside stator and see rub marks, you can file
these down a little on the armature also , but sometimes it is the
insulation that is rubbing
The 4 pole starter can be made by using a 6 volt Pontiac starter and
install everything from the
Stude starter and you will have to drill a hole for the locating pin.
This is really not necesarry. An original starter should work fine.
The Pontiac starters are rare and expensive.
You can not install additional poles in yours as far as I know.
An other problem is that the battery cable is of a too light a gauge
wire.
You can buy heavy #1 or #0 gauge battery cables at a tractor supply.
Autozone and Napa also have these.
On my own 6 volt cars I installed a ground cable from the positive of
the battery ( these cars are using the positive post of the battery as
ground and the negative feeds the car) directly to one of the bolts
that hold the starter in.
That really help cutting down the resistance.
Any comments, corrections or suggestions are invited.