The headlamp motor could fail due to corrosion of the motor and limit switch assembly. Should the motor or the limit switch fail, the headlamp assembly could stick in either the up or down position.
Lights
Triumph TR7 Lighting problems by year
0 complaints filed with NHTSA about the Triumph TR7's lights. Headlights, tail lights, brake lights, turn signals and interior lighting failures.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked daily. Complaints are owners' own reports and are not verified. How we use the data