Having a problem with tail lights, brake lights, and signals. Brake lights are brighter on right side. tail light is brighter on left side. the car is a 69 mach 1. it has all new wiring. new tail light harness, new head light harness, new under dash harness, new circuit board, new head light switch, new turn signal switch assembly. also changed the bulbs. don't know where else to look. could there be a ground problem somewhere?