My son was ticketed for the tail light violation. It has been fixed several times, but goes out. If there is a short, how is that fixed?
My guess is only the bulbs have been continuously been replaced thus ‘fixing’ the fault.
To find a short the wiring must be checked with a multi-meter or a continuity tester while the suspected wire(s) are moved.
To hopefully shorten this fault search, use the tester and with the tail light switch activated, check for 12 volts at the base of the bulb holder. Also check to ensure the bulb assembly is grounded properly.