The lead from the Aux DC contactor was routed through fuselage bulkheads. I secured it at the forward longeron with an adel clamp, routed it through a snap bushing in the upper fuselage structure, and secured it to the firewall with an adel clamp.
The wire was then marked, cut, and terminated with an appropriate ring terminal. The ring terminal was crimped with a hydraulic crimper and finished with double wall heat shrink.
The wire was then connected to the firewall pass through for the Aux alternator.