Now there ya go puttin’ me on the spot Tim. I just grabbed my blankie and was about ready to lay down and take me nap since I was up at 03:00 this morning!

Oh well, what the hey. Bruce, the copper tube is a thermostat or temperature sensor the controls the diaphragm on the Ranco Valve.
The instructions that Tim posted show you the complete installation instructions.
http://www.pbase.com/dennygraham/image/121512986
http://www.pbase.com/dennygraham/image/113817675
http://www.pbase.com/dennygraham/image/121531024
The switch picks up the power from the back of the ignition switch. If you still have the original 6v system in place it’s fused with a SFE 14 amp glass fuse.
Denny Graham
Sandwich, IL



Denny G
Sandwich, IL