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in the rear lights you may have two bulbs one is the turn signal the other one is stop light / tail light the stop light / tail light has two filaments, one for the stop light (21 watt) & one for the tail light (5 watt) it is possible that the tail light filament is blown, try replacing the bulb to see if that fixes the problem,also check all the fuses as well.......hope this helps......cheers.
Replace the turn signal switch. Bad contact inside causing a crossing of the circuits. When the turn signal is applied it should open the brake light circuit allowing for just the signal to work. Doesn't sound like the switch is doing it's job.
abad ground on that tail light unit could affect current load when turn and stop are used simultaneously. Although one side only is affected make sure of good grnd between trailer and tow vehicle. focust on the tail light unit in question. Replace the bulb. though rare, bulbs have been known to be the problem. If the bulb is breaking filiments ck the filiment orientation. filiments last longer in vertical orientation, where horizontal permits vibration to break the heated filiment when brake is applied.. good luck and let me know if This helped or not.
It's the bulb. There are two filliments in the bulb. One is for when you turn your lights on and the other is for breaking and blinker flashing. When the break filliment goes bad it causes the blinker to flash very rapidly. 100% the bulb. Change it and all will be good again. P.S. if it were a fuse none of the break lights or blinkers would work.