The rear body harness will run along the LH side rocker, then route aft along the corner where the wheelwell and floor meet. If the stock wheelwells are still intact there may still be the sheet-metal tabs that hold the harness in place. The harness then runs though the passenger/trunk bulkhead on the far LH side.
The courtesy lamp harness attaches to the rear body harness just aft of the bulkhead. The wiring then runs up the sail panel, then across to the light.
The GM Assembly Instruction Manual is a great reference for things like this.
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