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Dapper Lighting H4 Relay Kit

Original price $39.99 - Original price $49.99
Original price
$39.99 - $49.99
Current price $39.99
  • Description
  • Installation
  • Video

Dapper Lighting H4 Relay Kit - DLRH4 and DLRH2

Are your old sealed beams dim? Can't see at night? You may be experiencing voltage drops from your old stock wiring. Use a Dapper Lighting H4 Relay Kit to boost your voltage back to the factory spec. Our relay harness draws power from your battery rather than your wiring harness. See better and further on a budget with our plug-and-play 2 or 4 Headlamp relay harnesses available for all Classic Cars.

Replacement Relay can be found locally as part number: RY-51 



  • 20AWG Wiring with 14AWG Power Leads
  • 30AMP Relay
  • 30AMP Fuse
  • H4 Plugs
  • Single Power/Ground Battery Contacts
  • ~7FT in Length

NOTE: Four Headlight Relay Harness is configured for standard low/high beam functionality. Therefore, in high beam setting all four H4 headlight plugs will receive power.


What is a relay kit?

This relay kit draws power from your battery rather than your stock wiring harness. This harness should be used in applications where the users want to boost the brightness of their stock halogen lights.

When would I need a relay kit?

If your stock halogen lights are dim, this relay kit may improve light intensity.

Must be grounded in one spot on the chassis.

Along with most of our products, enjoy a 5-year worry-free warranty on this item. Have a problem? Give us a call and we'll get you a replacement. Avoid eBay and the hassle of tracking down sellers 5 years later. Dapper Lighting is here to provide you with the quality and service you need for your automotive products.

Download installation guide for Dapper Lighting H4 Relay Kit


Following Video is for Dapper Lighting H4 Relay Kit


Customer Reviews

Based on 19 reviews
Anthony S.
Great wiring harness for C3 Corvettes with halogen headlights. Plug and Play

The wiring harness worked great and was easy to install. Worked great on my 1974 Corvette convertible using halogen headlights. Plug and play.

Michael B.
1976 GMC Suburban

As advertised, simple installation, about 15 minutes. Started the truck and instantly noticed a significant difference in the headlights, strong, solid beams with no fluctuation or flickering. Just make sure you identify your headlights properly as single or dual per side..

Jay V.
Great product

Great product

Love Dapper!

I’ve always been happy with DL products. Great upgrades to my 1974 Datsun 260z.

Ralph C.
great replacement for stock setup.

great replacement for stock setup. Everything is included, relays and necessary sockets, to make installation a breeze. If more length is needed, they are more than happy to send you an extension that plugs right in.