Interior light harness. Porsche 911 Coupe 1969-84 › 90161203520

The OE Match interior light harness is replacement wiring for the cabin lighting circuit on the classic Porsche 911 applications below. It provides the electrical connections needed by the interior lighting installation; check the year and body-style qualifications carefully.

Fits

• Porsche 911 1969 Coupe
• Porsche 911 1970-73 Coupe
• Porsche 911 1978-84 Coupe
  
  The broader model listings do not extend the specific year and body-style applications above. Check fitment for your specific vehicle (model, year, engine) before ordering.
  
  Diagram ref no 15
  
  What Is This Part?

This is the wiring harness serving the interior lights, identified by part number 90161203520. It forms a dedicated part of the vehicle’s electrical installation, linking the cabin lighting into its operating circuit. The harness should be assessed alongside the lamp contacts, switches and earth connections when investigating a lighting fault. The exact reference is also identified as an interior lighting harness by a specialist wiring-harness manufacturer. 

What Does This Part Do?

• Connects the interior lighting: Provides the wiring path used by the cabin lighting circuit.
• Organises the wiring: Groups the relevant conductors into a dedicated harness rather than separate improvised runs.
• Supports electrical repair: Allows a damaged interior lighting wiring section to be renewed when inspection confirms that replacement is appropriate.
  
  Why Replace This Part?

Replacement may be appropriate if the existing harness has brittle or chafed insulation, broken conductors, damaged terminals or extensive previous modifications. Corrosion at connections can increase electrical resistance, while moisture entering a cable can cause deterioration beneath the insulation. These conditions can interfere with lighting operation even when the outside of a connection appears serviceable. 

Confirm the fault before replacing the harness. A poor earth, faulty switch or defective lamp contact can produce similar symptoms. Testing voltage drop while the circuit is operating can help identify excessive resistance in a wire or connection, rather than relying on appearance alone. 

When to Replace This Part?

• Visible insulation damage: Cracking, abrasion or exposed conductors found during inspection.
• Damaged connections: Loose, broken or significantly corroded terminals that cannot be repaired satisfactorily.
• Confirmed wiring faults: Testing identifies an interrupted conductor or excessive resistance within the harness.
• Unsuitable previous repairs: Altered wiring or damaged joints make dependable repair of the existing harness impractical.

Dim or intermittent lighting warrants checks of both the supply and earth sides of the circuit; it does not establish that the harness itself has failed. 

Where Is This Part Fitted?

Location: Within the interior lighting wiring installation, connecting into the cabin lamp circuit. Preserve the original routing and check that the wiring is not trapped or rubbing against adjacent trim during refitting. The exact part reference is identified for the interior lighting installation. 

Product Summary

• Product: Interior light wiring harness.
• Brand: OE Match.
• Purpose: Replacement wiring for the interior lighting circuit.
• Selection: Match the original reference, production year and body style before fitting.