What is the low beam headlight bulb size for a 1977 Audi 100 Series?

The 1977 Audi 100 Series uses a H5006 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 1977 Audi 100 Series?

The high beam bulb size for the 1977 Audi 100 Series is H5001.

Why are my 1977 Audi 100 Series headlights dim?

Dim headlights on a 1977 Audi 100 Series can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H5006 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1977 Audi 100 Series fog light?

The 1977 Audi 100 Series typically does not come with factory fog lights in all trim levels. If your vehicle is equipped with them, check the manual as sizes can vary by trim.

Is the 1977 Audi 100 Series single or dual beam?

The 1977 Audi 100 Series uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 1977 Audi 100 Series?

Yes, the 1977 Audi 100 Series comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H5006 LED conversion kit for the low beams.

Did the 1977 Audi 100 Series change headlight bulb sizes from the previous year?

Yes — the 1977 Audi 100 Series uses different bulb sizes than the 1976 model. The 1977 generation introduced this bulb configuration.

Is the 1977 Audi 100 Series the first or last year to use H5006 bulbs?

The 1977 Audi 100 Series is the only year in the 1977 generation to use the H5006 bulb for the low beam headlight.

How do I change the headlight on a 1977 Audi 100 Series?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old H5006 bulb counter-clockwise to remove it, then insert the new bulb and reassemble. Note: Audi vehicles use a CANbus system, so LED replacements may need an anti-flicker decoder. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 1977 Audi 100 Series?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved H5006 LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 1977 Audi 100 Series headlights?

A pair of halogen H5006 bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 1977 Audi 100 Series?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the H5006 position are available as direct plug-and-play replacements. Since the Audi uses CANbus monitoring, choose a CANbus-compatible LED kit to avoid dashboard errors.

The 1977 Audi 100 Series has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 1977 Audi 100 Series

What Size Bulbs Does a 1977 Audi 100 Series Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Hard (Tight clearances)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 1977 Audi 100 Series Have?

When it comes to nighttime visibility, the 1977 Audi 100 Series relies on an arrangement of 7 specialized bulbs. It features a standard lighting system powered by a dual-bulb halogen configuration using separate H5006 low beam and H5001 high beam bulbs for precise light distribution. Note that Audi vehicles typically feature a CANbus electrical monitor that checks for specific bulb resistance.

LED Flicker Warning

This vehicle is known to use a CANbus system. Installing standard LEDs may cause flickering.

Use a CANbus decoder.

Can You Put LED Bulbs in a 1977 Audi 100 Series?

Upgrading to LED is one of the most effective ways to modernize your Audi's appearance and safety profile. We recommend starting your upgrade with the H5006 low beams, as they see the most use. Adding a matching H5001 LED kit later will complete the look and ensure consistent lighting performance. Because Audi utilizes a CANbus system, standard LED bulbs may cause "bulb out" errors on your dashboard. Always opt for "Error-Free" or CANbus-ready kits which include the necessary resistors.

1977 Audi 100 Series Bulb Size Chart

Position	Bulb Size	Shop
Turn Signal Front	1157	Buy 1157 →
High Beam	H5001	Buy H5001 →
Low Beam	H5006	Buy H5006 →
Parking Light	1157	Buy 1157 →
Reverse Light	1156	Buy 1156 →
Brake Light	1156	Buy 1156 →
Turn Signal Rear	1156	Buy 1156 →

How do the 1977 Audi 100 Series's bulbs compare to other years?

The 1977 Audi 100 Series changed bulb sizes from 1976. The previous model year used a different configuration.

This bulb configuration covers the 1977 model years. ← 1976

Finding the best installation guide...

Other 100 Series Years

1976 1975 1974 1973 1972 1971 1970 1969

Other Vehicles That Use H5006 Bulbs

1992 BMW 3 Series 1991 BMW 318i 1991 BMW 325i 1991 BMW 325iX 1991 BMW 325is 1991 Isuzu Impulse