eph, I don't know if the B2400 electrical system is the same as the B7500 or not, but if it is:
The flasher is a 7 wire unit and connected to the battery bus along with the Hazard switch thru a 10 Amp fuse. If the fuse is blown both hazard lights and the dash hazard indicator lamps will not work. The battery bus is protected from the battery with a 30 Amp fuse.
The red/green wire on the flasher and the Hazard switch shoulld be at the battery voltage ~ 12.6 Vdc, The black wire on the Flasher and Hazard switch should be connected to the tractor frame.