I'm working on a 53 3/4 ton that's been converted to 12 volts.

the motor was in the truck when I got it and is 12 volts.

the colors of the wires are red which is the hot.
white, yellow, and green.

the switch has 4 terminals B P H and L.

I figure these to be batt, park, high and low

I don't know which of the yellow, green, and white wires are which.

I guessing the ground is through the mounting to the cab.

any ideas out there?

thanks
rolf


1963 c10