The wire harness and ancillary wiring assemblies can start to break down in time, almost imperceptibly at first, but the deterioration will get worse, with the very real potential of short circuiting when the insulation on the wires becomes brittle with age and exposure.
Fitting a new wiring related assembly will ensure perfect electrical functionality, why take the chance with the old, tired wiring with worn insulation, corroded fasteners and (possibly) old botched repairs?
Other related parts you may wish to consider:
Replacement with new parts is the reliable solution to problematic electrics. Add as many items as you wish to the same shopping cart, new clamps and cable-ties 0940406432 0940725401 0940714407 for example, and still only pay the same single fixed price shipping cost. This part may have other applications within the Suzuki model range.