Remove the starter relay, then test for twelve volts on the terminals in the socket. A test light will be more accurate for this than a digital voltmeter.
You should find zero volts on all four terminals. Have a helper hold the ignition switch in the "crank" position. Now you should find twelve volts on two terminals. Shift to "reverse" or "drive". The twelve volts should be lost on one of those two terminals. That is the one coming from the neutral safety switch.
You can release the ignition switch. For the two remaining terminals, move the test light's ground clip to the battery's positive post. We will be checking for good ground circuits. Probe those last two terminals. The test light should light up on both of them. One is just reading through the relay's ground circuit. The other is reading through the starter solenoid, then to ground.
Up to now we do not even have to know which terminal is which. I expect you will find one of those four terminals did not read correctly. Tell me which one, and I will figure out where to go next.
Saturday, April 22nd, 2017 AT 9:27 PM