make your own s/plug wire & socer the connections, they use that set only for test purposes, because it interfers with the radio.
if you made sure the test plug was grounded & connections clean etc & fuses are good then you have a bad plug wire orcoil. google ohm ing a coil. i like to make my own s/plug wire that i can soder the connection.
as far as not turning over go thru the starter bendix. maybe you need to wire brush the copper washer in the solinoid.
get a manual & go thru the starter system, ck brushes. clean armature, use emery cloth on brush contact area. then when you install the primary cover make sure it is flush. i think you have 1 demple for alignment.