99 Rodeo Right turn signal makes brake lights blink

Ok i have a 99 isuzu rodeo. just recently when you turn on the right blinker, it makes both rear tail ights/brake lights blink. and also makes the shifter click, safety switch activating going in time with blinker. so somehow its back feeding into the brake system. the turn signals are independant of the tail/stop lights on the rodeo. left blinker works fine. i have changed the flasher module, every single light bulb in the system front and rear. and still cannot find the problem. wiring all seems to be fine looks new still. i am at wits end. i mean the emergency flashers are on the dashboard, not the column. turn signals are not part of the brake lights. so how is this feeding power inot the brake lights? any help or suggestions greatly appreciated.