G'day Ric,
As for the score motor continually turning, sounds like one of the player one score wheel reset switches is not making good contact when a score unit is displaying zero.  There are 3 switches on each 10, 100, & 1000 score units (usually only two on 10,000 score unit).  The switch closest to the metal mounting plate is the "reset" switch.  These usually have two pairs of contacts for the single switch which should be closed when indicating a zero on the wheel.  A quick test (to see if it is a reset switch problem) while the score motor turns is to manually pull in the Player Unit solenoid once thus stepping the Player Unit off the "reset player one score wheels" position and onto the "reset player two score wheels" position.  As for the F relay clicking, this is normal operation while Player Unit sits on "reset player one score wheels" position & score motor turns (should stop clicking when manually operating Player Unit solenoid once).

Gary