LAMP FAILURE WARNING CIRCUITS FOR ROAD VEHICLES

摘要

A lamp failure warning circuit for a road vehicle includes a warning lamp, a first relay coil in series with a lamp to be tested and a first pair of normally open contacts in series with and operable by the relay coil upon failure of the lamp to be tested, the first pair of normally open contacts are closed and the warning lamp is operated. The circuit further includes a second pair of normally open contacts in series with the warning lamp and operable by a second relay coil to illuminate the warning lamp at the same time as an intermittently operable lamp on the vehicle is illuminated.