[PsYcHe]

I'm assuming that given the recent work you've done, the connection point for the main power wire is OK.

Could be a relay, but given that you're hearing the click, it suggests that the starter solenoid is engaging, but it doesn't think it has enough power to start.

Have you tried a jump-start? Could be that your battery looks OK on the test, but can't really deliver the juice required to start.