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Was any of the brake light bulbs changed recently, the wrong type of bulb may be used causing a short in the socket, and making the rest of the brake and signal circuit malfunction. I no bulbs were recently replaced, start with checking for corrosion in each bulb socket, signal and brake bulb sockets. Let us know what you find
THE BRAKE LIGHTS DO GO THROUGH THE TURN SIGNAL SWITCH. TO TEST, REMOVE THE PLASTIC COVER AROUND THE THE COLUMN, UNDER THE STEERING WHEEL. THE TURN SIGNAL SWITCH MUST BE IN THE OFF POSITION. YOU WILL NEED TO EXPOSE THE WIRES UNDER THE STEERING WHEEL. DO NOT DISTURB THE WIRES IN THE YELLOW JACKET. THEY ARE AIRBAG WIRES. YELLOW PLUGS YELLOW JACKETED WIRES ARE AIRBAG.THE WIRE IN QUESTION HERE IS YELLOW BUT IT IS NOT IN A YELLOW JACKET, [ SLEEVE ]. NOW, PUSH ON THE BRAKE PEDAL. THE YELLOW WIRE IS LEFT REAR TURN & BRAKE WIRE, DARK GREEN IS RIGHT REAR TURN & BRAKE WIRE. BRAKE PEDAL DEPRESSED, IF BOTH OF THOSE WIRES HAVE POWER, ALL OF THAT IS OK. IF THE YELLOW WIRE HAS NO POWER TURN SIGNAL SWITCH IS BAD
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.
Sounds to me like a bad ground. When the current can't complete through a ground circit it feeds back through the elements ancd can cause all sorts of wierd syptoms.
The fast blink itself can be casued by a burnt out bulb I would check that first.
Then I would check the trailter harness if there is one and unpluch any harness that may be plugged into it. also check each bulb to see if it is seated well. you may be able to see if there is corrorsionaround the bulb terminals at this time is so yo may need to replace the light assembly. Also you could look for any spot where maybe someone in the past tried to tie into the harness to hook up additional lights etc. this may allo moisture in and corroded to the point the wire is "open"