Answer to "Why do my turn signals stop flashing when I apply the brake?"All of these problems mentioned can be the result of a bad ground. When you operate both blinkers and brake lights and the blinkers stop blinking, it’s because the circuit is not good enough to operate both lights. Bad ground. Same with headlights and blinkers. Probably the same with fog lights. Easy solution is the add an additional ground for the tail lights. Tail lights are the farthest away from the battery. Find the ground wire in each tail light assembly and add an additional wire and connect it to a good solid metal point and your problems will be all gone!!