1972 dart - stopped running while at 50 mph ? no warning

67Dart273 said
2...Cap, rotor, wires..........Inspect cap for carbon tracking, dirt, moisture, same for rotor and LOOK FOR rotor "punch through." This is not very common with points. CHECK resistance of the coil wire with a meter. "Rule of thumb" for resistance wire is no more than 1000 ohms per foot, but if good, I've never seen one "that high." Usually much lower.

what is rotor punch through ? and what am i looking for ? i don't know what that is . as for the coil wire , i

moparjon said
tested resistance of the coil to cap wire , but could not get a steady reading . it would just flash a number briefly before going back to 1 , but flashed anywhere from 565 to 998 . so i got the 74 valiant slant six started up , and after a short warming . took out its coil wire and put the darts in there . the valiant ran , seemingly just fine .

i just now attached the dist. cap end of the coil wire to alligator clips then the spark tester . good spark .