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Your photo shows the red insulation on the starter motor cable discolored. This could be a sign of a poor cable connection under the burned spot where the wire enter the termination. Your voltage reading at the starter motor with the motor running should be very low not high. Suggest use an ohmmeter to read the resistance of the cable from the starter switch to the motor, should be nearly zero ohms. Could also use a voltmeter on the cable and read voltage from the starter switch to the motor with the motor running, should be near zero volts.