A New 78105 Cable Assembly for Chute Spinner Motor. This is used on the poly V box spreaders Fisher Poly-caster, Western Tornado and Blizzard Ice-chaser.
This connects to spreader harness 78104 and to the spinner motor.
If you need the parts list and related wiring, you can find that here.
For a complete diagram of this spreader and all parts and wiring, visit this link.
Make sure you have dielectric grease. Corrosion is the most common destroyer of these plugs.