Retro Bright H840 Switched Ground Wiring Harness for RetroBright LED Headlights

The Retro Bright H840 Switched Ground Harness is a specialized wiring adapter designed to enable Holley RetroBright LED headlights to function properly on vehicles with switched ground electrical systems, particularly older Toyota models.

Key Features:

• Converts switched ground systems to standard H4 wiring configuration with two hot wires and one ground
• Allows RetroBright headlights to connect to most Toyota vehicles including Land Cruiser and other 1986-2002 models
• Plug-and-play installation with no cutting or major reconfiguration of factory wiring required
• Includes integrated relays to properly switch the ground circuit
• Easy and effective installation designed for DIY installers

Many Toyota vehicles use a switched ground headlight control system that prevents modern LED headlights from working correctly out of the box. This harness solves that problem by converting the factory switched ground system to the standard H4 wiring configuration that RetroBright headlights require. Simply plug the harness between your factory connector and the RetroBright headlight for proper operation and full LED lighting performance.