All right. I'm going to remind those of you who don't already know: I have about a 5-year-old's grasp of electronics. So let me explain what I'm doing on and those of you with real eductations can hopefully guide me right.
There are three wires from the sensor, a white, a brown and a thicker black wire.
When I check resistance between the white and the brown wires, I get a reading of 515 ohms.
Then, when I crank the starter, I get an AC reading that varies between 1.9 and 2.5 volts, which I would conclude is faulty, based on Ingo's 3V number.
So the next question would be whether I should replace the sensor or try to figure if it's incorrectly spaced. I'm inclined to just replace it, since it's not failing in a consistent manner, and nothing has moved the sensor relative to the crank as far as I can see.
Should I just hit it with some penetrating oil and order a new sensor?
And wwest, I also do want to check the solonoid and starter. But (again, because I'm not very smart about this stuff) could you give me a couple of steps to do that?