On the '46 Ford V-8 model, the ballast resistor is mounted on the interior of the car on the cowl, above the steering column, on a special rubber mount. One the '47-'48 model, the resistor is located on the top of the coil on a flat rubber strip which has 2 machine screws with the heads on the bottom, the thread shaft coming through the rubber. One screw mounts the rubber strip to the coil(-) terminal and the ballast is placed on this coil terminal screw. One screw holds the resistor to the rubber. A ignition wire is connected from the ignition switch to this side of the resistor. Remember, the ignition wire from the switch goes to one side of the resistor, the current flows through the resistor and enters the coil through the (-) side if you are using the 6 volt positive ground battery set up as originally done.