Try attaching the red lead from the meter the battery +
black lead from the meter to the connection(s) at the alternator. (one at a time) Take meter reading. You should have near 0 volts as a rule of thumb, if not then the connection at the starter motor might be suspect. At which point you simply move the black meter lead backwards through the circuit, first to the starter, then to the next connection and so on working toward the positive terminal on the battery. When you get the near 0V reading than you have pinpointed the electrical fault, it is somewhere between the test point that reads 0 and the one that reads >.500mV.


One last question, was/is either one of your battery leads heavily corroded?