![]() Probably behind the jack in the DS rear corner, there should be room to tuck a little bracket in there some place. Now I need to find a good spot to hide a relay on the reverse light circuit. I'll find a 10/3 stranded bundle and run that down through the rig. I was being cheap with using the signal from the back up lights to run the full power system dedicated to the trailer. That's a good idea to run a "real" wire for the back up lights, "just in case". I'll run it when I run the brake controller wire. The trailer is rigged for it to charge its onboard battery when traveling, but I haven't run the line yet. PPC, there currently isn't a dedicated 12V line running to the 7 Pin plug. Now I need a 7 Pin beast to fit my new adventure trailer. ![]() I put in a new 4 prong system because that's all I needed. Mine came with the remains of something that let the magic smoke out a decade or more before I got it and a mangled twisted bracket under the bumper that might have held a 4 prong plug at one time. This is a good solution in that any trailer you decide to tow will be fully capable electrically not just your own trailer. With a 7-pin setup you should already have a good 12V supply at the connector that you can use to power the external backup light circuit through a relay. The solenoid operation was marginal because of the voltage drop was even larger. My boat trailer used an electric solenoid to disable the surge brakes when reversing. Even the normal wattage bulbs produced brighter lights during this test. Both bulbs were brighter than the single bulb using the factory wiring. I pulled one of the two bulbs and the brightness very significantly increased so I ran a 14 gauge test wire directly from the battery to the bulbs. Several years ago I discovered that using higher wattage bulbs caused a significant voltage drop. My experience indicates that the wiring that supplies the vehicle backup lights is undersized. In addition to incorporating a relay in the trailer's electrical system to control the trailer I would also use a relay in the LC/LX reverse light circuit to supply a true 12V to the 7-pin plug.
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