H4 (Sealed Beam) Headlight Relay Kits

H4 Headlight Relay KIt
Our Headlight Relay Kits are incredibly simple to install!

If you own a 20, 30, 40, or even 50 year old vehicle, one of the problems that you face is poor lighting. Poor lighting is not an inconvenience, it’s a safety issue!

So how do you improve your classic vehicle’s lighting? Should you replace the headlights? Replace them with higher wattage units? Actually neither . . . and higher wattage bulbs could actually damage your wiring harness – a bad thing!

Our Headlight Relay Kits are designed to allow your stock headlights to perform to their fullest. Our 18 piece kits are plug-and-play and include everything you need to install them.

An easy way to tell if your stock headlights are not performing optimally is if they appear to have a yellow hue to them when the vehicle is running. This is an indication that they are not getting the power from the vehicle’s electrical system that they require to work properly.

The “yellowness” is caused because the vehicle wiring harness, the headlight switch, the HI/LOW beam switch, and the connectors to the headlights themselves experience wear over time. This causes a loss of voltage and excessive heat in the headlight circuit resulting in dim headlights.

Hella Waterproof Relays in Use
Close Up of the Hella 40 Amp Waterproof Relays

Our Headlight Relay kits totally eliminate the voltage drop (and resulting heat) caused by this by allowing your stock components and wiring harness to power only the coils of the relays. Those require approximately 2% of the power that a pair of headlights requires! The net result is that your headlights will work like new; even better than new. After the installation, your stock headlights will be bleach white with the vehicle running!

Installation is plug-and-play and does not require cutting or splicing into your stock wiring harness. You’ll wonder how you got along without it!

We Offer Two Kits

  • HRK1 – for vehicles with a dual filament HI/LOW beam mounted on each side. It is compatible with bulbs of up to 200 Watts per filament.
  • HRK2 – for vehicles with a dual filament HI/LOW beam and single filament HI beam bulb on each side. The harness included in this kit is pre-wired to accommodate dual filament HI/LOW beam bulbs in both locations for additional headlight brightness if that is desired. It is compatible with bulbs of up to 100 Watts per filament.

Both Kits Include

  • (1) Pre-assembled Harness, loomed in Semi-Rigid Split Braid tubing, and terminated with OEM style connectors
  • (2) 40 Amp Hella Waterproof Relays
  • (1) Waterproof ATC Style Fuse Holder & 30 Amp ATC fuse
  • All hardware required to install it

You absolutely, positively will not have to run to the hardware store to install this kit. How do we know? Simple. We’ve actually installed them ourselves.