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The WESTERN 29047 Adapter Harness is a genuine OEM electrical adapter designed for Western and Fisher snow plows equipped with a 3-plug plow system and 3-port isolation module. This harness serves as the critical connection between the vehicle control harness (26345) and your vehicle specific headlight adapter, which connects to your 3 port isolation module (29070-1), ensuring proper communication between the truck and plow electrical system
Every 3 plug Western and Fisher plow needs this adapter in order to properly install your electrical wiring . See the detailed chart below. As you can see, the 29047 highlighted in yellow serves as a jumper harness between the Vehicle Control Harness (26345) and the vehicle specific headlight adapter.

If you are looking to upfit a truck with the 3 wire system, you would also need the following:
Vehicle Specific Headlight Adapter
29070-1 - 3 Port Isolation Module
26345 - Vehicle Control Harness