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Tom’s Bronco H4 Headlight Wiring Diagram and Installation Guide

"Upgrading to a Tom’s Offroad (formerly Tom’s Bronco Parts) H4 headlight relay harness resolves the common "dim headlight" issue in classic 1966-1977 Ford Broncos by rerouting power directly from the battery to the headlights. The wiring diagram follows a plug-and-play logic where the factory driver-side headlight plug serves as a "trigger" for two 30-amp or 40-amp relays, while heavy-gauge wires deliver full battery voltage to new H4 ceramic sockets, bypassing the restrictive factory headlight switch and floor dimmer circuit. The Evolution of Bronco Lighting: Why the H4 Upgrade is Mandatory For owners of the first-generation Ford Bronco, the..."

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