Originally Posted by DADS50
Looks like the jc article differs from the film strip. Third paragraph
The film strip looks like a switch that is installed in a passenger car.
Maybe that is how GM wired the switch for the passenger car.

At first I was thinking the switch in the passenger car was a spring loaded switch.
Where as, once the engine started you would let it spring back to the ON position.

But in 1949 the passenger car had the film strip switch and also a push to start button.
With a solenoid starter.
1949 Chev passenger car starting procedure pdf page 31 under Starting
The truck used a floor foot activated starter.
Maybe that is the reason for the different, ignition ON positions.

Then again JC article may be incorrect.
It's how the rear terminals are wired.

I don't know which is better on how the Coil is energized, when cylinder is in the:
A. Center position
B. 2 O'clock position

Both the film strip and the JC article agree the switch is locked when the cylinder is in the 10 O'clock position.
You need the key to move into the locked position.

1954 Chevrolet 3105 Deluxe Panel Truck
w/Factory HYDRA-MATIC