Headlight Wiring Loom Harness & Relays (Upgrade) Holden WB Holden - WK1552

If your Holden’s headlights are looking a bit tired at night, the issue often isn’t the globes — it’s voltage drop through ageing factory wiring and a worn headlight switch. Designed specifically for Holden WB models including Ute, One Tonner, Panel Van and Statesman, this Headlight Wiring Loom Harness & Relays kit upgrades your lighting system by delivering power straight from the battery through dedicated relays. Relay-Boosted 12V System: Designed to optimise lighting performance by supplying direct battery voltage to the headlights.Dual Relay Configuration: One relay for Low Beam, and One relay for High Beam, Ensuring stable voltage delivery and balanced load handling.Plug N Play Design: Connects directly into existing factory headlight connectors, which act as trigger signals for the relays. No permanent modification to original wiring required.Maximum Light Output: Eliminates voltage drop caused by ageing, thin factory wiring, headlights burn whiter and brighter — even with standard globes fitted.Switch Preservation: The factory WB headlight switch is a known weak point. This system reduces the switch’s role to a low-current trigger, dramatically extending its lifespan.Integrated Fuse Protection: Fused power supply protects the new circuit and vehicle electrical system.Period-Correct Connectors: Uses colour-matched plugs to maintain a factory-style appearance under the bonnet.For Holden owners wanting brighter, safer night driving and protection for their hard-to-find headlight switch, the Headlight Wiring Loom Harness & Relays offers a smart, reversible upgrade that improves performance without compromising originality.