My turn signals and brake light won't work? It's a

try this

I bet you swapped the turn signal and brake lights cable.

Look Behind the triangle panel on the left side of the bike. Next to the battery. FUSES

Sounds like a short in the socket or a bad ground.
The parking light is one circuit and the brake turn signal is another.

Well the brake light and turn signal circuits are on two different fuses, but they both go thru the turn signal switch.
So I would start by checking for power in and out of the turn signal switch for each circuit.

Spray WD-40 in the ignition switch and on the turn signal adapter. It works.

http://officialharleyparts.com/wiring_diagrams.php

need to check the multi-function switch. the brake light signal goes through the turn signal switch on the steering column. the brake lights come on if the turn signal is not being operated. the circuit for the brake light can loose contact in the switch.

The odds of both switches going bad at the same time are pretty slim but maybe you're just now noticing it.

The front brake light switch is located in the right handlebar switch housing. You'll have to take the two bolts out of the housing and separate the halves. You'll probably have to take the throttle and idle cables out as well. The switch is located on the inner face of the housings facing the front master cylinder. It's held in by a single screw. If you wish to retain your original wires, you'll have to unsolder the wires and resolder them to the new switch.

The rear light switch is a pressure switch. Find the metal brake tube coming out of the rear brake master cylinder. Follow it back towards the rear wheel and you find a tee with a pressure switch screwed into it. Unplug the wires and replace the switch.

Now, the brake lights, tail lights and probably the turn signal lights are wired with a subharness that plugs into the main harness. If this plug has come loose or just the pins for the brake lights have come loose, your light won't work.

I something here helps.

Good luck
Steve

possibly flasher unit faulty
or turn signal switch