Regarding use of the original inline voltage dropping resistor:
If the coil measures 1.4 ohms or more the external resistor is not required. However the resistor could be used anyway without a problem.
If the coil measures less than 1.4 ohms the external resistor is required.
Resistance is measured across the two terminal "BAT." and "DIST." with no wires on the terminals.
Install Directions | 