I bought a used Neptune coin-op machine, coin slot is removed and wiring is still there. I ran a load, it was fine. Now it wants 50 cents before it will start another cycle and I don't have any money...(just kidding), there is no coin slot to put money in. I tried to pass a quarter through the coin sensor, no luck, I tried unplugging the 4-wire coin sensor harness from the board, no luck. I have a wiring diagram (came in the machine) but I'm not sure which of the 4 wires to connect, or does it have to be a momentary connection to simulate a coin passing through? Wires are blue, red, white, white w/blue. Thanx for any help or suggestions.