This wiring harness is designed for signal and communication connections within battery management systems (BMS) in energy storage systems (ESS) and EV battery packs. It features multiple connector types along a braided, abrasion-resistant sleeved cable, with clearly labeled connection points (e.g., B-P17, D-P15) for accurate installation and reduced wiring errors. The harness uses color-coded and twisted-pair wiring for signal integrity, along with heat-shrink tubing for strain relief and moisture protection. Suitable for OEM/ODM battery pack assembly, with customization available on connector type, length, and pin-out configuration.