Early Defender's were produced without a relay for the headlights. This resulted in high currents passing directly through the headlight switch. Over time, the heat generated from these high currents melted the contacts within the switch and caused it to fail, resulting in the loss of headlights. The voltage drop from the under-rated wiring can be more than 1V! This reduces light output significantly. After my switch failed I decided it was time to add a relay into the wiring system. This is an easy installation which does not require any modifications to the existing headlight loom. A H4 male connector plugs into the existing headlight plug and powers the relays. Google "Headlight relay" to find a suitable wiring diagram to follow. Making the relay loom is a simple procedure that anyone with a basic degree of electrical knowledge can achieve. Ready-made kits are also available. Search google and you should find one. WANT TO CONTRIBUTE? Visit this page for ways you can assist my film productions. https://www.roamingtheoutback.com/how-you-can-help/ Join me on Patreon to support the creation of more videos and access Behind The Scenes: https://www.patreon.com/RoamingTheOutback Visit my travel blog to explore Australian travel destinations, get touring vehicle preparation ideas, and read my latest gear reviews. https://www.RoamingTheOutback.com STICKERS - EBOOK - TSHIRTS - MUGS - DONATIONS: https://www.roamingtheoutback.com/shop/ My VIDEO & 4X4 GEAR Recommendations: https://kit.co/RoamingTheOutback FACEBOOK: https://www.facebook.com/roamingtheoutback INSTAGRAM: https://www.instagram.com/roamingtheoutback/ PINTEREST: https://www.pinterest.com.au/roamingtheoutback/ PATREON: https://www.patreon.com/RoamingTheOutback #DefenderModifications Pick a date. Live Your Somedays, Today. ... https://www.youtube.com/watch?v=TKr9t56tJxg