Hopper not filling ..router plug

New member looking for some help please.

I have bought a donna kebab barcrest machine and recently had the coin mech converted to accept the new pound.

I have got everything working except the hopper is not being filled automatically by the new pounds ...(it was by the old pounds)

I am guessing this is to do with the router plug which has 1 (blue) wire not connected. (Maybe slipped out when I removed the coin mech)

I have tried to connect this wire to all the slots/pins on the bottom row with no success.

Any help appreciated . Please see photo attached