If your truck was converted from 6 V to 12 V, there is no ballast resistor because it was not used in the 6V system. If you use a coil on 12 V that is made to run with a resistor and you don't use one, sometimes the oil will boil out of it and sometimes the spark will breakdown the plastic.


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!