My driver side turn signal flashes fast its not the bulb the brake and the turn signal wont light up but it stays on when i turn the head lights on
Make sure all the bulbs are working in the turn signal. Some front turn signals will use two or more bulbs per side. If any one of these bulbs are burned out it will cause the turn signal to flash at a fast rate. It also could be a bad control lighting control switch a.k.a. multi-function switch.
SOURCE: electrical problem
Find the ground wire on one of the lights and add another ground wire to a good clean metal surface and see if that fixes the problem. It defently sounds like a ground problem at one of the lights.
SOURCE: 2003 Chevy S10 Pickup fast flashing signal lights
like he said check you brake box to though. we did that and the wires to the brake box came loose.
SOURCE: chevy trailblazer - brake lights do not work
try checking the brake light switch attached to the brake pedal,very common problem. has about 5 contacts in it ,they all operate different things. If you have a scan tool with live data readings you can watch them all. also check fuses and bulbs ,but you say the signals work so that seems ok.
SOURCE: how to replace front turn signal bulb
its easy. when the sinal flashes fast its just telling you a light is out. there might be 2 ways to fix this. open the truck look for the housing for the lights. now you may have to just turn the harnest where the wires are. or you just nee a phillps screw driver and unscrew the plastic cover off.
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