
- Last seen
- Joined
- Dec 29, 2014
- Thunderbird Year
- 1955
The headlamps are controlled by the Front Electronic Module and instrument cluster. The headlamp and multifunction switches are hard-wired to the instrument cluster. When the headlamp switch is in any position, the instrument cluster sends a command to the FEM through the communication network. The FEM processes this information and outputs the appropriate command to the headlamps (which are hard-wired to the FEM). This is the same for the low beams, high beams and flash-to-pass position.
To answer your question, both the high and low beams receive voltage from the Central Junction Box. The FEM supplies the ground to complete the circuit and illuminate either the high or low beams.
doug7740
1955 Thunderbird Blue

To answer your question, both the high and low beams receive voltage from the Central Junction Box. The FEM supplies the ground to complete the circuit and illuminate either the high or low beams.
doug7740
1955 Thunderbird Blue
