Yesterday my left turn signal stopped working. When I turn it on it stays solid. And makes a loud buzzing noise. Now I've checked the fuses and all the lights and they are fine. What would be the problem. I need helps soon as I have already gotten pulled over twice because of it.

 

Check your trailer light connector for corrosion. Could be that, a faulty bulb, or a bad ground

 

The flasher relay is stuck. You need a new flasher relay.

 

I bought a flasher relay at autozone for $17. And it's the led one to slow down the blinking because I have 2 color led lights for my marker/signal lights in the front (bluefish white for running and flash amber for signal) I just have to find where the relay is.

 

Ok, that explains it.. If your LEDs do NOT have a resistor on them then your traditional flasher relay will not cut enough voltage to "blink"... Your bulbs are in fact blinking, its just so fast that it looks like they are staying lit..
You could put your own resistors in line at the bulbs before the socket, but I really would not recommend that.. Resistors will heat up and possibly melt wires..
On my street bike I had this issue with flush mount turn signals and I made a resistor pack to solve the issue. I put it in a insulated box in the tail section to protect them from melting the surrounding areas..

That relay you bought should work.. Your flasher relay should be in the access panel inside the cab on the passenger side footwell. Pull the panel off and the box is behind it..

 

should of mentioned this before...