pull the motor cover off and look on the contactor panel, there should be a row of glass/ceramic fuses there. Check those, one might be blown most likely. The diagram i'm looking at shows the top and bottom fuses to be 5amp fuses which would not be used for accessory circuits, then the 3 middle ones are 15A fuses, one of those may be blown.

As for the wiring, like brewski said, the wiring does run over the mast for all circuits on the platform so keep this in mind also, if you do not find any blown fuses then you will need to check that cable and connectors for broken wires or bad connections.

by the way, this is not a reach truck ;o)
OS030BFN24TE119 (the OS indicates it is an order selector truck)

Wire #003 pos. is fused through fuse #2 10amp. This wire runs over the mast in the harness.