I think you will find there is a plug on the rear of it, so I'd simply unplug the unit. If you still get problems then the next thing would be to check the trailer socket itself for a short and lastly the wires to the trailer socket and the brake switch from the unit's plug.
I was going to install a Tekonsha, but it failed and I couldn't get any service satisfaction. So I installed a nice simple RedArc and this was later transferred from my Disco to my Defender.
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
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