on a 742A, the payout counter reset coil is typically fired by a reel mech B switch and the payout counter zero switch mentioned in post #2.
if you are a schematic reader, pick any 742A-xxx schematic available in
https://bingo.cdyn.com/slots/if not, the reel mech B switch (horizontal switch above the coin relay on left side of the reel mech) typically has yellow (30) and orange/black (78-1) wires on the blades. The 78-1 wire goes thru the reel and hopper plugs to the payout counter and the mating blade to the 78-1 wire connects to the payout counter reset coil.
you can jumper the zero switch closed to test - the payout counter reset coil will just fire on every spin instead of only firing if reset is needed.
yell if that's not enough info. I think david lee has a nice picture of where the reel mech B switch is if you need it.