目前,在许多车辆的后组合灯中制动灯和后小灯是安装在1只双丝灯泡中的。这种安装方式有2个缺点。第一,如果某只双丝灯泡的品质较差或灯座允许通过的电流较小,则会出现烧灯丝或烧灯座的现象,以致在车辆运行过程中出现仅一边有制动灯或后小灯,甚至在左右两边都没有制动灯或后小灯。在这种情况 At present, the brake lights and rear lights in the rear combination lamps of many vehicles are installed in a single double-filament lamp. This installation has two drawbacks. First, if the quality of a two-filament light bulb is poor or the current allowed by the lamp holder is small, there may be a phenomenon of burning the filament or burning the lamp holder so that only one side of the lamp or the rear Small lights, or even left and right no brake lights or rear lights. In this case