Finding 12V to Courtesy lamps

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I want to add lights under the dash which is connected so they turn off/on with the courtesy/dome lights. Does anyone know where to tap into the 12V line for the courtesy lamps? It appears the lamps are controlled through the door modules so the 12V doesn't come through the wiring harness. The dimmer and override switch in the dash seem to control a relay or electronics in another location. Any help would be appreciated.

Thanks