You will need to get the motor running so you can take some readings with a mulitmeter to see what the wires are doing. The black wire to the center of the black box should be an earth. The red from the black box will go to the battery +. The black box should have 4 wires going to it, 2 from the alternator,one to the battery + and one to frame earth or battery -.Does the orange wire go to the black box? I think it should. Blade engagement,headlights,solonoid will all be run from the ignition switch. From the on position on the ignition switch then to the headlight switch/engagement switch, fuel solonoid runs with ignition on
