For some reason my left turn signal blinks fast, as if there is a bulb out, but there are no bulbs out? Could it be the fuse?

 

There is a bulb out somewhere, or a break in the wiring. The turn signal is designed to blink faster when a bulb is out to signal that you need to check your bulbs.

 

Does the turn signal light up and work properly ? I am with Red, bad electrical connection somewhere in the circuit. If not bulb or wiring could be a bad relay.

 

Another thing is there could be a short on the left side somewhere. A flasher is basically a self resetting breaker, and when the turn signals are on the load provided by the bulbs is enough current to trip the breaker causing the flasher to operate. When a bulb burns out, the resistance decreases thus increasing load (basic ohms law) and the flasher operates faster. So when a flasher goes into overdrive, you have an increase in load on that side of the circuit. typically its a burnt out bulb, but if all your bulbs are working then you have a short to ground somewhere on the left side.

 

Wow..... I don't even know where to start looking for a break or short... I'm electrically impaired.

But I did just go and check, all lights on the truck function properly. No burn outs.

 

Any reputable shop should be able to pull the bulb and put an ohm meter on it to check the circuit at minimal expense.

 

You did not happen to put in an LED lamp did you?? Some of them don't have the resistor needed to prevent the "fast blink" as the resistance is not high enough.

Most are OK now but there are still a few out there that need the resistor.

BJ

 

Nope, still all OE parts.

 

No.

But it could be the flasher itself. Read the manual, figure out where the flasher is, and spend the $4 for a new one.