A Rational 40.06.078P Wire Harness carries power to the door light for dependable visibility during use.
The wire harness carries power and signal connections to the door light assembly so illumination operates properly when the unit is in use. Its dedicated construction matters because secure insulation, correct connector fit and application-specific wiring layout maintain dependable electrical continuity in a heat- and movement-exposed door area.
The wire harness may be nearing replacement if the interior door light works intermittently, fails to turn on consistently or could lose power when the door is opened or closed. Physical signs can include worn insulation, loose or damaged connectors, discoloration or brittle sections and environmental signs may include heat exposure, moisture or repeated door movement that can accelerate wear.
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