Found my problem today,the harness is siamesed to one of the hydraulic hoses on the pight side of the pantogragh and is routed over two diffrent rollers on the reach arms(double reach truck)...on the back side of the pulley is a guide will a small piece slide over it to keep the hose/harness centered on the larger guide pulley,well the harness somehow got wrapped up under this smaller guide and it tore into the harness/wires,causing the issue when the reach was fully extended. Repaired it temporarily until i can get the new harness as this one is pretty tore up