old skool 68 vette mill in a circa 72 T bucket. Accel super coil and dual pts dist. Problem only ONE set of pts fire. Each set has it's own wire to the NEG coil pole. When BOTH wires on NEG pole onle ONE breaker fires. Take 'em BOTH off pole and put ONE on at a time. EACH will fire alone, but only ONE when together on NEG. pole. WHY ??