You need to disconnect the whole harness, or likely most of it. Plugs (connectors in them) corrode and burn up more often than wires most of the time. All components have wires / plugs that connect to the main wire harness. You can disconnect components from the main harness and test all wires in the harness without removing it. And yeah, being outside in Texas for any length of time you might need a new wire harness.I may have to replace wiring harness. As to test its continuity, I have to remove the harness,
I would have to disconnect the whole harness to test it. or make multiple cuts into every wire.