Dapper Lighting H4 Relay Kit

Sold as single relay harness kit.

The Dapper Lighting H4 Relay Kit is designed for classic cars using H4 headlight connections. If your old sealed beams are dim or difficult to see with at night, you may be experiencing voltage drop from aging factory wiring. This relay harness draws power directly from the battery instead of relying only on the original headlight wiring, helping restore stronger, more consistent power to the headlights.

Available in 2-headlamp and 4-headlamp configurations, this plug-and-play relay kit is a practical upgrade for improving headlight performance on classic vehicles.

Replacement Relay: A replacement relay can be sourced locally using part number RY-51.

Specifications:
Wiring: 20 AWG wiring with 14 AWG power leads
Relay: 30 amp relay
Fuse: 30 amp fuse
Connector Type: H4 plugs
Battery Contacts: Single power and ground battery contacts
Length: Approximately 7 ft

Grounding Note: This relay kit must be grounded to one spot on the chassis.

FAQ:
What is a relay kit?
A relay kit draws power directly from the battery instead of relying only on the stock wiring harness. It is commonly used in applications where the user wants to improve power delivery to the headlights.

When would I need a relay kit?
If your stock halogen lights or sealed beams are dim, this relay kit may help improve light intensity by reducing voltage drop through the original wiring.

Warranty: Backed by a 5-year warranty. If you have a problem, contact Dapper Lighting and we will help you get a replacement.

Important Note: The 4-headlight relay harness is configured for standard low/high beam functionality. In the high beam setting, all four H4 headlight plugs will receive power.