Automotive Electronics90% match
H4 Relay Wiring Harness
$25–$50
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Why this is here
Mentioned in youtube.
Curated by Workshop Notes
Why this product
The H4 Relay Wiring Harness aligns with the classic automotive restoration and lighting upgrades vibe by addressing the electrical needs of modern lighting in vintage vehicles.
Curated by Workshop Notes
What's included
- Heavy-duty gauge wiring
- Integrated relay circuit
- H4 bulb compatibility
- Protects vehicle's electrical system
- Enhances LED headlight performance
Where to buy
Links verified June 11, 2026
