| 摘要 |
<p>PURPOSE: To correspond to both trailers having different number of stop lamps by connecting a changeover means which changes over to a judgement value corresponding to the number of stop lamps provided and a display means for displaying disconnection to a detection means which compares a detected current value of a stop lamp lighting control circuit with the judgement value and detects the disconnection. CONSTITUTION: Stop lamps 3 including two stop lamp 2a and four stop lamps 2b are connected in parallel through a disconnection detection sensor 5 in a stop lamp lighting control circuit 4. A judgement voltage is changed over by turning a changeover switch 52 connected to the disconnection detection sensor off in the case of two stop lamps and turning the changeover switch 52 on in the case of four stop lamps. A judgement voltage of the two stop lamps 2a or the four stop lamps 2b is compared with a voltage which corresponds to a current flowing in the stop lamp lighting control circuit 4 by a comparator of the disconnection detection sensor 5. When input voltage is lower, it is judged that a disconnection occurs, and an alarm lamp 10 is lit.</p> |
