[Army_MP_From_MO]

How do I check the polarity? My problem is that with the wires hooked up like they would from the factory they wouldn't light up at all. When I rewired it at the socket they began to flash, so did both brake lights, very faint and the third brake light began to flash opposite of those. Are you saying if I replace the flasher relay it will fix all of this and I can rewire back to original configuration?