When using a Mallory Magnetic Breakerless distributor do you need to run a ballast resistor? The guy that had the boat before had a Unilite w/ a ballast resistor in place. We have a new Magnetic Breakerless to replace the Unilite. If we do need a ballast resistor what kind of voltage should I get on the coil side. I was reading only 3.8 - 4.0 volts before. Thanx!