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Porsche > 911 & 912 (1965-1989) > 911 1974-1977 2.7L / 1976-77 3.0 Carrera > Electrical & Relays >

Relays / Fuses

Relays / Fuses

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DISPLAYING 33 to 41 (of 41 products)
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Relay for seat belt. Porsche 911 - 91161810201
3
Relay for seat belt. Porsche 911
Special Order item
91161810201
Product Information
Product Information
Relay for seat belt.

porsche

Fits:
Porsche 911 1974-89
Porsche 911 Turbo 3.0 / 3.3L 1975-89

* Please check and match the part number of your relay in your car before ordering.

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91161810201
91161810201

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Relay Windscreen Wiper Interval. Porsche 911 1974-75 - 91161814600 - 3.208.200
2
Relay Windscreen Wiper Interval. Porsche 911 1974-75
91161814900/1
Product Information
Product Information

Wiper Interval Relay 

The OE Match Wiper Interval Relay is a high-quality OEM-style replacement. This relay controls the intermittent wiping function, ensuring your windscreen wipers operate at the correct timed intervals during light rain and changing weather conditions.

Fits:

  • Porsche 911 1974-1975 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1975 3.0L Turbo (930)

Diagram ref no 34

Manufactured to match the original specifications, this OE Match relay provides dependable performance, direct-fit installation and reliable operation, making it the ideal replacement for ageing or failed original relays.

What Does the Wiper Interval Relay Do?

The wiper interval relay is an essential component of your Porsche's electrical system. It controls the timing circuit that activates the intermittent wipe feature, allowing the wiper blades to pause between sweeps instead of operating continuously.

By regulating the delay between each wipe cycle, the relay helps maintain clear visibility during drizzle or mist while reducing unnecessary wear on the wiper motor and blades.

The relay is responsible for:

  • Controlling intermittent windscreen wiper operation.
  • Delivering consistent timed wipe intervals.
  • Sending electrical signals to the wiper motor.
  • Providing smooth, factory-correct wiper performance.
  • Improving visibility and driving safety in variable weather conditions.

Why Do Wiper Interval Relays Fail?

Electrical relays naturally deteriorate over time, particularly in classic vehicles where components may have been in service for decades. Heat, vibration and moisture can all contribute to internal wear and eventual failure.

Common causes include:

  • Burnt or worn internal electrical contacts.
  • Ageing electronic components.
  • Corrosion caused by moisture ingress.
  • Heat damage from years of continuous operation.
  • Fatigued solder joints and internal circuitry.
  • Oxidised terminals leading to poor electrical connections.

Original relays fitted to 1974-1975 Porsche 911 models are now approximately fifty years old, making replacement a sensible preventative maintenance upgrade.

Symptoms of a Faulty Wiper Interval Relay

A failing relay can cause several noticeable problems, including:

  • Intermittent wipe function no longer operates.
  • Wipers only work on continuous settings.
  • Irregular or inconsistent wipe intervals.
  • Delayed or erratic wiper activation.
  • Wipers stopping unexpectedly during operation.
  • Audible relay clicking without correct wiper movement.
  • Complete loss of intermittent wipe functionality.

Replacing the relay is often the quickest and most effective way to restore normal operation.

When Should the Relay Be Replaced?

The OE Match Wiper Interval Relay should be replaced whenever intermittent wipe performance becomes unreliable or electrical testing confirms relay failure.

Many Porsche owners also choose to replace ageing relays during restoration projects or preventative maintenance to improve long-term reliability and reduce the risk of electrical faults.

A new relay helps restore dependable operation while preserving the original driving experience of your classic Porsche.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91161814900
91161814600

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Safety ceramic fuse 16AMP. Porsche 911 / 924 / 928 / 944 / 914 - N0171214
3
Safety ceramic fuse 16AMP. Porsche 911 / 924 / 928 / 944 / 914
Special Order item
N0171214
Product Information
Product Information
Safety ceramic fuse 16AMP.

porsche

Fits:
Porsche 911 1965-89
Porsche 914 1970-76
Porsche 924 1976-85
Porsche 924S 1986-88
Porsche 944 1982-86
Porsche 928 1978-86

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N0171214
N0171214

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Safety ceramic fuse 25AMP. Porsche 911 / 924 / 928 / 944 / 914 - N0171215
2
Safety ceramic fuse 25AMP. Porsche 911 / 924 / 928 / 944 / 914
Special Order item
N0171215
Product Information
Product Information
Safety ceramic fuse 25AMP.

porsche

Fits:
Porsche 911 1965-89
Porsche 914 1970-76
Porsche 924 1976-85
Porsche 924S 1986-88
Porsche 944 1982-86
Porsche 928 1978-86

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N0171215
N0171215

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Safety ceramic fuse 5AMP. Porsche 911 / 924 / 928 / 944 / 914 - 90017300690
1
Safety ceramic fuse 5AMP. Porsche 911 / 924 / 928 / 944 / 914
Special Order item
90017300690
Product Information
Product Information
Safety ceramic fuse 5AMP.

porsche

Fits:
Porsche 911 1965-89
Porsche 914 1970-76
Porsche 924 1976-85
Porsche 924S 1986-88
Porsche 944 1982-86
Porsche 928 1978-86

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90017300690
90017300690

The product you are viewing cross references to these numbers
Safety ceramic fuse 8AMP. Porsche 911 / 924 / 928 / 944 / 914
2
Safety ceramic fuse 8AMP. Porsche 911 / 924 / 928 / 944 / 914
Special Order item
N0171211
Product Information
Product Information
Safety ceramic fuse 8AMP.

porsche

Fits:
Porsche 911 1965-89
Porsche 914 1970-76
Porsche 924 1976-85
Porsche 924S 1986-88
Porsche 944 1982-86
Porsche 928 1978-86
Spare bulb and fuse kit (12 Volt). Porsche 911 74-89 - PCG91130000
1
Spare bulb and fuse kit (12 Volt). Porsche 911 74-89
Special Order item
PCG91130000
Product Information
Product Information
Spare bulb and fuse kit (12 Volt).

porsche

For use on:
Porsche 911 (1974 - 1983)
Porsche 911 Turbo (1975 - 1989)
Porsche 911 Carrera (1984 - 1989)

The set comprises:
2x high beam/low beam light (H4 60/55W),
2x indicator light,
reversing light (21W),
2x position light (4W),
2x tail/brake light (21/5W),
1x licence plate light (5W),
1x fog light (18W),
2x safety fuse (5A),
2x safety fuse (8A),
2x safety fuse (16A),
2x safety fuse (25A).

The packaging comprises a white Porsche Classic designer metal box with foam inserts.

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PCG91130000
PCG91130000

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Spare light box for Porsche 911 G - PCG91130001, PCG91130000
1
Spare light box for Porsche 911 G
Special Order item
PCG91130001
Product Information
Product Information
Set of light bulbs and fuses (12 volts), specially put together for the Porsche 911 G. The bulbs and fuses are stored in a metal box in Historic Porsche Red, with raised Porsche logo in White and a foam insert inside.

porsche

For use on:
Porsche 911 (1974 - 1983)
Porsche 911 Turbo (1975 - 1989)
Porsche 911 Carrera (1984 - 1989)


Contents of the set:

1x high/low beam bulb H4 60/55W
1x indicator, reversing light bulb P21W
1x brake/tail light P21/5W
1x parking light bulb T4W
1x number plate light bulb R5W
1x side indicator light bulb W5W
1x 5A safety fuse
1x 8A safety fuse
1x 16A safety fuse
1x 25A safety fuse

Additional information: Excluding France.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

PCG91130001
PCG91130001
PCG91130000

The product you are viewing cross references to these numbers
Wing screw M6x12 for relay cover panel. Porsche 911 / 964 turbo - 90002910202
2
Wing screw M6x12 for relay cover panel. Porsche 911 / 964 turbo
Special Order item
90002910202
Product Information
Product Information
Wing screw M6 x 12 for relay cover panel. 

Fits:
Porsche 911 - 1972 to 1989
Porsche 911 turbo - 1975 to 1989
Porsche 964 turbo - 1991 to 1993


Click 'Zoom in' for large parts diagram.
Diagram ref no 30



Related reference numbers
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90002910202
90002910202

The product you are viewing cross references to these numbers
DISPLAYING 33 to 41 (of 41 products)
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About Relays / Fuses

Relays and Fuses – Electrical Protection and Performance for Porsche Vehicles

Relays and fuses are critical components in your Porsche’s electrical system, ensuring that power is delivered safely and reliably to every circuit. From the ignition and lighting systems to the fuel pump and cooling fans, these components protect wiring and electrical modules from overload, short circuits, and potential failure.

At Design911, we stock a comprehensive selection of genuine and high quality relays and fuses for all Porsche models - including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each part is built to the highest standards to ensure dependable performance and precise compatibility with your vehicle’s electrical system.

What Do Relays and Fuses Do?

Fuses act as the first line of defence in your vehicle’s electrical circuits. They break the circuit when current exceeds safe levels, preventing damage to components or wiring.

Relays act as electronic switches that control high-current devices using low-current signals. They allow systems like headlights, fuel pumps, fans, and wipers to operate efficiently without overloading the control switches.

Together, they form a vital network that maintains safety, functionality, and reliability across your Porsche’s electrical system.

Why Do Relays and Fuses Fail?

Over time, electrical components are subject to wear, heat, and environmental factors that can lead to failure. Common causes include:

  • Overheating or overcurrent loads blowing the fuse.
  • Aging or corroded relay contacts leading to intermittent operation.
  • Moisture ingress or corrosion within the fuse box or relay socket.
  • Vibration or mechanical stress loosening connections.
  • Electrical short circuits caused by wiring faults or damaged insulation.

Symptoms of faulty relays or fuses can include malfunctioning lights, non-start conditions, intermittent accessory operation, or completely dead electrical systems.

Why Replace Faulty Relays and Fuses?

Replacing worn or damaged relays and fuses is essential to maintain your Porsche’s electrical integrity and prevent more serious system failures. Using quality replacements ensures proper current flow, system protection, and long-term reliability.

Benefits of replacement include:
Restored function of electrical systems and accessories.
Protection from wiring damage or electrical fires.
Enhanced safety and dependability.
High-level quality and fitment for lasting performance.

Every relay and fuse in this range is precision-tested and manufactured to match factory specifications, ensuring seamless compatibility and peace of mind on the road.

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