All the lights pulse as soon as you start the car, interior, heads, tails.. I am waiting on new distrib cap, rotor, spark wires. I changed the plugs not too long ago. I ask about the spark gap cause i dropped one of them a few times, oops.. I've yet to do a voltage test on the battery, lacking a meter at the moment but i'm sure it will be irregular. I am looking at the voltage regulator as a suspect. JD