I'm getting a clicking when I put a quarter in the coin mech. (3-4 clicks)
Not happening when I put a nickle or dime in.
When the price is set at less than a quarter, nickles are kicked out as change, one click at a time. This only happens when the coin has been accepted, so your mech may be ok.
The click you want to hear is from the vend solenoid below the bottle stack.
You may want to start your test there, by putting 110 volts directly to the 2 terminals on it, but only for a brief second. If it works, then check further back to your freeplay switch then of course back to the coin mech.