6-circuit wire harness specifically designed for use with the 12256491 Tail Light, which is a left-side, or "street side", wire harness. It's used on Knapheide's Utility Body (UB) models.
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Knapheide 12010140, 6-Circuit Wire Harness, UB Left/ Street Side

6-circuit wire harness specifically designed for use with the 12256491 Tail Light, which is a left-side, or "street side", wire harness. It's used on Knapheide's Utility Body (UB) models.

Left-side harness: Designed for the driver's side or "street side" of the vehicle.
6-Circuit: Refers to the number of wires or connections it provides.
It's specifically used to connect and power the 12256491 LED tail light.
LED surface mount light wire harness for a surface-mount LED light, indicating it's for a modern, low-profile lighting setup.