Left turn signal works / don't work, brake light

This is probably a bad earth connection, Try checking the connection to the rear light cluster for corrosion around the wiring plug, remove it and clean the connections, also check the bulb fittings, clean and replace bulbs into the holder. This is normally where the problem is, and could be due to water getting into the rear lights, good to check for this too.

because of no light flasher on left side the front one will go faster .maybe the left rear light is burn. and brake lights are control by the brake switch on brake pedal hardware, might be unadjust

when you have a fast blinking light the front or rear turn signal is probably blown and for your brake light check your fuse.

Fast flashing dash signals mean there is a bulb issue-DEFINATELY!

Replace the turn signal switch. All of these lights run threw it.

try replacing the bulbs and put some electical grease on them before putting them in, could have condensation on them.

Hello. The symptoms you are describing are likely due to a poor ground. Temporarily install a new ground wire by securing a piece of copper wire to the frame with a self tapping screw. Use this ground wire along with the hot wire to see if each of these lights works. If it does, trace the ground wire back to the frame, unscrew it and clean up the metal with emery cloth so you reestablish a good ground.

any increase in bink speed is direcly related to a bulb being burt out.

It sounds like a wiring fault - an earthing problem. Have a look around the lights/inside the lights themselves.. rear and front lights, brake lights, etc ...check the wires for corrosion/splitting. In particular check any black earth leads where they attach to an earthing point.

You have a broken wire to the turn/brake light portion of the light as they use the same wire. Or where the plug goes into the light assy could be bad. Torsion mount lights are horrible and you should think about replacing with a universal light that you can wire direct.