[dscott]

There is no other device in the circuit. The regulator is the only source for the voltage.

I would change the prop to the adjustable type. I don't remember which way the plunger goes in the stock valve but when you take it apart just reverse the way it is. It will be a little more difficult to change over but I think the effort is worth it. There is no provision for a light on the new prop valve.
Don