💡Headlight Bulb Size
Geo Spectrum Headlight Bulb Size
Find the correct headlight bulb size for your Geo Spectrum. Covers low beam, high beam, fog lights, and turn signals for all years.
Quick Answer
The Geo Spectrum headlight bulb size depends on the model year and trim. Common sizes include H11 (low beam), 9005/HB3 (high beam), and H16 (fog lights) — see the full breakdown below.
1985-1989
1985-1989Low Beam9006/HB4 or H4
High Beam9005/HB3 or H4
Fog Lights9006 or 880/881 (if equipped)
Turn Signal (Front)3157 amber
Headlight TypeHalogen reflector
Notes
- →Never touch halogen bulbs with bare fingers — skin oil causes hot spots and premature failure
- →Replace bulbs in pairs — if one side burned out, the other is likely near end of life
Frequently Asked Questions
- What size headlight bulb does a Geo Spectrum use?
- The Geo Spectrum headlight bulb size varies by year. Newer models often use factory LED units, while older models use H11, H7, or 9006 halogen bulbs. Check the year-specific specs below for your exact fitment.
- Can I put LED bulbs in my Geo Spectrum?
- If your Geo Spectrum has halogen headlights, you can install LED replacement bulbs. Look for bulbs with a proper beam pattern (projector-compatible) to avoid blinding other drivers. Some models may need anti-flicker adapters.
- How do I replace the headlight bulb on a Geo Spectrum?
- On most Geo Spectrum models, you can access the headlight bulb from behind the headlight assembly in the engine bay. Twist the bulb socket counterclockwise, pull out the old bulb, insert the new one (don't touch the glass), and twist back in.
- Why does my Geo Spectrum headlight keep burning out?
- Frequent bulb burnout on the Geo Spectrum is usually caused by a loose connection, moisture in the housing, touching the bulb glass during installation, or a voltage regulator issue. Check the connector and housing seal.
Geo Spectrum Repair Guides
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