I have read on lot on the forums and done a lot of work and am still stuck. I may just be having bad luck but if there is any test I can do before I start buying and replacing I am hoping I can find it here.

The problem is intermittent starting. It either starts up perfectly and quickly. Or the solenoid clicks loudly but the starter does not turn at all. Battery has been tested and swapped. Starter has been replaced. Wiring has been tested.

All I can figure is that the solenoid contacts are not making a good connection...sometimes. Very frustration because it will usually work fine. But then it doesn't and you are stuck. It happens with the engine hot or cold. With the ambient temperature in the teens or in the eighties.

Short of replacing the battery, starter (again) and all wiring what can I do to actually figure out what is going on?