Fog/Drive Lamps
The 901 613 503 20 is a dashboard-mounted mechanical or push-pull switch used in early Porsche 911 / 911S / 911L and 912 models (1960s era) to activate the front fog lights. It is often grouped with the rear-window heating and warning-light switches, depending on vehicle specification.
In use, pulling or pressing the switch completes the circuit for the fog lights, sending power (via fuse and relay) to the fog lamp units. The switch usually has an internal light (“light-pipe”) or indicator so you can tell when fog lights are active.
Fits:
- Porsche 911 65-68 + 911S, 912 USA version 911L with red lighting strip
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 912E 4CYL 1976
Why / when it should be replaced
· Even though the fog light switch is a relatively simple component, there are several reasons why it might need replacing:
· Internal wear or contact failure. Over time, the internal contacts inside the switch can wear, corrode, or lose tension, leading to poor electrical contact. If that happens, the fog lights may not activate when the switch is engaged.
· No illumination of the switch itself. On models where the switch includes a light-pipe or internal lamp so that you can see the switch position, failure of that internal illumination can make it harder to know whether the fog lights are on and may indicate internal switch failure.
· Switch stuck or mechanically broken. The pull/knob mechanism may become sticky, stuck, or physically break, especially after decades of use, or due to heat/cockpit environment ageing. A switch that doesn’t move properly or won’t stay in the “on” position cannot reliably activate the fog lights.
· Intermittent operation / flickering. Even if the switch appears to work, intermittent contact inside the switch might cause the fog lights to flicker, drop out, or not turn off properly.
· Fuse or wiring feedback problems. In some cases, a failing switch can lead to blown fog-light fuses or feedback to wiring loops, especially if there is an internal short or poor contact. Replacing the switch may be required after troubleshooting electrical issues.
Diagram ref no 13
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90161350320
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 912E 4CYL 1976
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Porsche Fog & Driving Lamps | Clarity, Safety & Performance Lighting
Fog and driving lamps are essential lighting components that enhance visibility during adverse weather or low-light conditions. Positioned low on the front bumper, fog lamps illuminate the road immediately ahead, cutting through mist, rain, and dust, while driving lamps provide long-range light for night or performance driving. Over time, exposure to heat, vibration, and moisture can reduce their effectiveness — making replacement vital for safety and appearance.
At Design911, we supply premium fog and driving lamps engineered for precision fitment, durability, and optimal beam performance. Our range includes standard halogen units, high-performance LED conversions, and smoked or clear-lens upgrades — all crafted to meet Porsche’s design and performance standards.
Whether you’re restoring a classic 911 or upgrading a Cayman or Cayenne for better visibility, Design911’s lighting range ensures you can see — and be seen — in all conditions.
What Do Fog and Driving Lamps Do?
Fog and driving lamps improve safety and confidence in challenging driving environments by enhancing forward visibility and road illumination.
Core Functions:
- Fog
lamps provide a wide, low-angled beam to reduce glare and illuminate
the road in fog, rain, or snow.
- Driving
lamps project a longer, brighter beam for enhanced distance vision.
- Improve overall lighting balance with dipped and main beams.
- Increase road presence and style with Porsche’s signature lighting design.
- Comply with road safety and visibility regulations.
These lamps ensure your Porsche performs safely and confidently — no matter the conditions.
Why Do Fog & Driving Lamps Fail or Degrade?
Even precision-engineered lighting components can deteriorate over time due to weather, road debris, and age.
Common Causes of Failure Include:
- Cracked or chipped lenses from stone impact.
- Water ingress leading to fogging or corrosion.
- Faded reflectors or dull lenses reducing light output.
- Burnt-out bulbs or LED module failure.
- Damaged housings or mounting brackets from vibration or contact.
When fog or driving lamps fail, visibility decreases dramatically — compromising safety and diminishing your Porsche’s premium aesthetic.
Why Replace or Upgrade Your Porsche Fog / Driving Lamps?
Replacing worn or damaged lamps restores full lighting performance, while LED or smoked-lens upgrades add a modern, performance-driven look.
Key Benefits:
- Restores maximum visibility in fog, rain, or low-light conditions.
- Enhances safety and driver confidence.
- Improves light clarity and beam distance with modern LED or HID technology.
- Direct-fit designs for Porsche 911, Cayman, Boxster, Panamera, Macan, Cayenne and other models.
- Available in clear, smoked, or chrome finishes.
- Ideal for restorations, replacements, and performance upgrades.
High-quality fog and driving lamps from Design911 ensure your Porsche remains safe, stylish, and ready for any condition.
Highlights
- Precision-engineered Porsche fog and driving lamps.
- Available in halogen, LED, or HID configurations.
- Durable housings and weather-sealed designs.
- Clear, smoked, and sport-finish lens options.
- Direct-fit for modern and classic Porsche models.
- Perfect for visibility restoration, repair, or upgrade projects.
