| 摘要 |
The fuse in the tail lamp circuit of a vehicle is replaced with an auxiliary circuit containing its own fuse, voltage dropping resistance means, a low voltage buzzer and a mercury switch. The buzzer and switch are connected in series across the resistance means. The mercury switch is adhesively attached to the underside of the gearshift housing so that the switch is always closed when the gearshift lever is in "Park" position. Since a vehicle's headlight switch, when closed, normally energizes the tail lamps as well as the headlights, if the headlight switch is inadvertently left closed, and the headlights thus energized, as soon as the shift lever is moved into "Park" position, then the buzzer sounds. In this way, the motorist is warned that his headlights have not been turned off.
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