I would try it with the old switch. More than likely you will find that you can't vary the fan speed as much. If you can change the bulb to 12 volt, do so. That spring you are talking about is a resistor.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!