Headlight Relay Conversion Harness

The Painless Wiring Headlight Relay Conversion Harness (Part #30815) is a universal halogen conversion kit designed to upgrade sealed-beam headlight systems to modern H4 bulb compatibility. This harness simplifies the electrical conversion process, allowing vehicles with older sealed-beam headlights to benefit from improved brightness and the wider availability of replacement halogen bulbs without requiring complete fixture replacement.

The conversion harness handles the relay switching and power distribution needed to operate two H4 halogen bulbs safely and efficiently. H4 bulbs deliver more usable light output than traditional sealed-beam units, improving visibility during night driving while maintaining compatibility with existing vehicle electrical systems. The kit's universal design allows installation across multiple vehicle platforms, making it a practical solution for restoration projects, vintage vehicle upgrades, and applications where headlight modernization is desired without major wiring overhauls.

This product is ideal for classic car enthusiasts, restoration shops, and vehicle owners maintaining or upgrading older vehicles with sealed-beam headlight systems. The harness eliminates compatibility issues between vintage electrical designs and modern lighting standards, reducing installation complexity. Painless Wiring is recognized for producing dependable aftermarket wiring solutions, and this conversion harness reflects that focus on straightforward, functional electrical engineering for automotive projects.

Compact and weighing just 2 pounds, the harness is easy to route through existing engine compartments and integrates efficiently with both original and custom wiring layouts. Whether performing a complete restoration or a targeted lighting upgrade, this halogen conversion harness provides a direct pathway to improved headlight performance on classic and vintage vehicles.