not sure what you mean by 'other post'
There is a single big wire on the starter that holds 12V all the time
There is a smaller wire that connects to the solenoid (on the side of the starter) that is tied into the ignition circuit.
Turning the key energizes the solenoid which throws the big wire 12V to the starter windings.
Check for 12V on the big wire.
Check for 12V on the trigger wire in all key positions (off -> 0v, on -> 0v, start - 12v)
if voltage isn't there, the problem is upstream and could be the connection to another relay that has baffled many and bypassed by few. I have a writeup in here somewhere about how to bypass the intermittent starter issue.