Keep in mind that the solenoid draws around 50 amps while engaging the pinion. Easier and better to refit the starter and measure the volts on the solenoid while attempting (but failing) to crank the engine. Less than 9 - 10 volts signals a bad connection somewhere, probably in the starter section of the ignition switch*. More than 9 - 10 volts means the solenoid is faulty, or the brushes are not making proper contact with the commutator.
* Assuming there is no relay. You can tell by the size of the cable on the starter switch. If it's the same as on the solenoid, you don't have a relay. If it's much smaller, you do.
Edit: I just measured the current at 30A.
Last edited by R.T.; 02-08-15 at 10:48.