discovery 4 trailer plug connections - AULRO Nov 07, 2015discovery 4 trailer plug connections Hi. I'm new to the Land Rover world, just bought Discovery 4 MY13 SD V6 HSE. Just wondering about the 2 wired in sockets at the rear for trailer connection. Both 7 pin round, 1 has white cover and 1 has black cover. than any difference function wise between the 2 plugs ? Covers the wiring and also Discovery 4 Wiring for a trailer - 4x4community Apr 23, 2014Discovery 4 Wiring for a trailer; Results 1 to 13 of 13 Thread: I had a Brad Harrison plug installed by land Rover fitment center in Centurion on my D4. They basically attached both thick cables to the front battery and routed it to the back. Nothing fancy. CATS.
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