Help on a 71 GTO, electrical problem

I'm Having problems with the wiring in the brake lights when i brake they sometimes come on. When I turn on my turn signal the passenger lights, being there two lights in the back, come on and the left light blinks first then the right light like its pointing to the right >>>>>>. As for the driver side lights, one light is brighter then the other light.  I thought it would be the sockets or the light bulbs; however, that isn't the problem.  I just can't figure out what's up with them. As a side note the lights in the front work perfectly since the turn signal switch had been replaced and all lights on the front work exactly like their supposed to. Any help would be appreciated. Thanks.