Starter won't crank, just clicks when I turn the key

[bertrenolds5]

I checked my power wires, + & - both have over 12volts, small wire has continuity when I checked it with ohms from one end to the other end plug. How many volts should I be getting off the small wire at the starter when it is cranked? Should I disconnect the small wire then run my volt meter through it to a good ground somewhere and crank the car to test it?

Also, on the small black wire it goes from 1 wire and is split into two wires that go to a plug. Is that normal? seems like someone rigged it or is that stock wiring?