Porsche 356 Headlight Switch Part Number: Complete Guide to Finding the Right Replacement

If you own a Porsche 356, you know that every component matters. The headlight switch is a small but critical part that controls your car’s lighting. When it fails or needs restoration, finding the exact Porsche 356 headlight switch part number is essential to ensure proper fit and function. This guide will help you identify the correct switch for your specific 356 model, understand the differences between early and late versions, and make a smart purchase decision.

Understanding the Porsche 356 Headlight Switch

The headlight switch on a Porsche 356 is a multi-function unit that typically controls headlights, tail lights, and interior lights. It sits on the dashboard and can be a push-pull or rotary design depending on the year. Porsche used several variations over the production run from 1948 to 1965, so knowing your car’s exact model year and chassis number is critical.

Early vs. Late Switches

Early 356 models (pre-A and A) used a simpler push-pull switch with a twist function for dimming. Later models (B and C) adopted a more integrated rotary switch with a separate knob for interior lights. The part numbers differ significantly:

• Early (Pre-A and 356A): Part numbers often start with 644.613.xxx.xx or 356.613.xxx.xx.
• Late (356B and 356C): Part numbers typically begin with 616.613.xxx.xx or 356.613.xxx.xx with different suffixes.

Common Part Numbers by Model

Here are the most frequently referenced part numbers for Porsche 356 headlight switches:

• 356A (1955-1959): 644.613.111.00 (complete switch assembly) or 356.613.113.00 (early version with separate knob).
• 356B (1960-1963): 616.613.111.00 (round knob with integrated interior light control).
• 356C (1964-1965): 616.613.113.00 (updated electrical contact layout).

Note: Many repro parts use the same numbers but with slight variations. Always verify with a vendor using your chassis number.

How to Identify the Correct Part Number

To find your exact Porsche 356 headlight switch part number, follow these steps:

Check Your Chassis Number

Your chassis number (located on the driver’s door jamb plate or stamped on the tunnel) tells you the model year and variant. For example, chassis 100001 to 110000 are pre-A, while 150000+ are 356C. Cross-reference with a parts catalog or online database.

Inspect the Switch Itself

Original switches often have a small stamp on the metal body or the back. Look for a seven- or nine-digit number starting with 644, 356, or 616. Clean the switch gently to read it. If the number is worn, photograph it and compare with known references.

Consult a Restoration Guide

Books like "Porsche 356: The Technical Guide" or "Porsche 356 Parts & Restoration Catalog" provide detailed part number listings. Many Porsche enthusiast forums also offer cross-reference charts.

Differences Between Original and Reproduction Switches

When buying a headlight switch, you have two options: original NOS (new old stock) or reproduction. Original parts are scarce and expensive but maintain authenticity. Reproductions are affordable and often have improved internals (e.g., better contacts). However, some reproductions have slight dimensional differences that may affect fit.

Original NOS

• Pros: Exact fit, original appearance, no quality concerns.
• Cons: Very expensive (often $300+), hard to find, may have dried grease.
• Where to find: Specialty Porsche dismantlers, swap meets, online forums.

Reproduction

• Pros: Readily available, lower cost ($40–$150), newer components.
• Cons: May have slightly different knob shape or bezel, plastic vs. bakelite materials.
• Recommended vendors: Stoddard, Pelican Parts, Sierra Madre Collection (these are legitimate Porsche specialists).

Step-by-Step Replacement Guide

Replacing the headlight switch is a straightforward job. Here’s how:

1. Disconnect the battery – Prevent short circuits.
2. Remove the dashboard knob – On early cars, it pulls off; on late cars, unscrew the set screw.
3. Unscrew the bezel nut – Use a small wrench or pliers.
4. Pull the switch out – Gently wiggle it out from behind the dash.
5. Label the wires – The switch has multiple terminals: power in, headlights, tail lights, dash lights. Draw a diagram or take a photo.
6. Install the new switch – Reverse the process, ensuring wires match.
7. Test before reassembly – Reconnect battery and check all functions.

Final Recommendation

For most owners, a high-quality reproduction switch from a trusted Porsche parts supplier is the best choice. It offers reliability and cost savings without sacrificing authenticity. If you own a concours-level car, seek an original NOS unit or have your original restored. Always confirm the part number with your chassis number before ordering. A mistake may lead to poor fit or electrical issues.

To summarize, the Porsche 356 headlight switch part number is not a single number but varies by model. Use this guide to narrow down your options, and don’t hesitate to ask specialists for verification. A properly working headlight switch keeps your 356 safe and enjoyable on the road.