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To begin with, there is no relay for the brake light. That thing you hear clicking is a circuit breaker. You probably have a short circuit between the rear brake light switch underneath the bike and the brake light itself. If the tail lights work, then you know what circuit is ok.
Look at your rear brake master cylinder. Find the metal line coming out of it going to the rear of the bike. In that line, under the bike, you'll find a pressure switch. This is the rear brake light switch. The front brake light switch is located in the right side handlebar switch housing. If neither switch works the brake light, odds are you have a short circuit in the wiring from the rear brake light switch to the rear brake light itself.
I am having the same issue on a 2005 FLHRCI Road King Classic. Basically the left turn signal comes on when I start the engine. It will not cancel by pushing the left turn signal button. However, if I push the right turn signal button the left will go off and the right will start blinking. Sometimes, this same action starts all four signals blinking (like the emergency flashers). It is very erratic. I have Kuryakan pancea rear taillights and brake light. The brake light went out so I went a bought a new brake/taillight with a new adapter. Brake lights work now but the blinker problems happens whether the back lights are connected or not. Front turn signals are stock.
Get a test light and stick the probe in the connector on the bike and clip the other end to a good ground. Turn on the key and run the turn signals, brake light and running light. Move the probe from hole to hole until you find the turn signal flash, the brake light and the running light. Obviously, the turn signals will flash, the brake light will go on and off when you hit the pedal, and the running light will stay on constantly. the three wires on the brake light are ground, brake and running light. Should be a simple matter to figure out which wires go where from here. If you are using digital lights, i.e. LED lights, the current only flows one way. As an example, if you hook up the turn signals and they don't work, reverse the wires.
Does the brake light work with the front brake lever. Sounds like wrong type of bulbs in there or bad turn signal flasher...Do the lights light up when you hit the switch and just stay lit...Also i can tell you that mine had to have the bike running in order to create enough amps to even make the flasher trip. I eventually put bigger bulds in each turn signal to draw more so they work with it running or not. It had 2156 bulbs in and i put 2157. Oh the flasher unit is under the fuel tank.
sounds like a poor ground issue, pull out the headlight and check all connections in there, your turn signals are on seperate feeds than the lights but they will probably share the same ground/earth in the headlight