A 15-foot coiled electrical cable with a black jacket, used for the standard 7-way lighting/electrical connection between a tractor and trailer (stop, turn, and running lights). Meeting SAE J560B, J2222, and J2394 specifications, the "I" designation marks this as an economy-tier version of the standard 179.3010.15 cable, offering a more budget-friendly option while covering the same basic tractor-to-trailer electrical connection.
