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it's the grounds if they're both flashing fast it's definitely grounds take a test light and see if its got power goes through the test light grounded to the frame and if the light comes on then it's definitely your grounds
I would change out the turn signal bulb on the right front. A blown bulb can cause the fast flash issue. The signals staying on is not related to the bulb being blown. That is most likely a problem with the multifunction switch, the knob you use to signal.
Rear signal works, just not the front one? This thing should have clear "turning lights" on both front fenders that come on when the headlights are on and the corresponding turn signal is activated. Do they come on? If so, your most common issue is probably a bad bulb socket or wiring. Easily obtained and replaced at a local auto parts store. If the turning light doesn't come on (and the bulb is good) then probably the multi-function switch in the steering column is the problem. Fairly easily obtained but more difficult to replace.
The bulb for the turn signal/brake light is a double filament bulb. It will come on with the lights on, but should light the second filament, making it brighter, with the brakes applied or turn signal on. It could just be a bad bulb, but one common problem on these years of truck is the rear light circuit board and requires the whole assembly to be replaced. Start by checking the bulb first though.
Hope this helps. Good luck!
The turn signals are designed to tell you when a bulb burns out. Turn your signal light on and walk around the vehicle to check if the outside signal lights are working. Sounds like you have both front and rear bulbs burnt out for the left.
Sounds like you have a bad ground. Follow the wiring harnesses under the hood and in the trunk, there should be a ground wire going to the chassis or to the body. If they are all clean and tight, you might be looking at a bad light socket.
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