yes the ballist res could be bad

coil could be bad

I used the pertronix unit that replaces the points and have not had to change the pertronix rotor yet,just a new cap now and then

I guted the porcilin shell of a ballest res and solderd the ends on a piece of #10 stranded wire to hind the fact it was bypassed

you by pass it to give the pertronix the full 12 volts and it has lots of fire with the 40,000 volt pertronix coil

easy hook up red to + and black to - side of coil with the one key wire that is on the coil now with you points

this was on the 68 Dart,another good upgrade is one of the newer soild state voltage regulaters,it was way better and the lights did not go dim when at idle and lights on

I tell you this cause I changed points for 2yrs every 2-3 months with that old car till I replaced it

now I have had that same set up in 3 diff cars and 9 yrs with out ever a problem