I have a problem with my tail light on my 1989 883 sportster. When i turn the key one click to the middle, from the off position, my tail light is off but when i hit the brake pedal it lights up. But when i turn the key one more click for the ignition, the tail light is solid red like the pedal is being pressed. I know the wiring must be wrong somewhere and im not quite sure where to start checking. Thanks for your help.