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12V lifepo4 battery with small solar panel for keep it all topped up..12V to 3.3/5V step down to power the esp32 on the trailer.(maybe a switch to turn it off)3.3v output of the esp32 into another optocoupler to raise the voltages back up to 12V and also make them PWM programmable do some fun things with the brake and turn lights..

About the Snow Plow Light Kit The snow plow light kit from Vision X packs adaptability and performance into a slim and easily mounted solution. Each light has three different operation modes: high, low, and halo(daytime running lights) The XIL-7RDSPKIT was designed to be mounted above snow plow blades in order to help the operator see as much of the roadway as possible to ensure accurate removal of snow and slush.

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Polycarbonate Covers Polycarbonate Covers allow various patterns of light distribution, including Spot, Euro, Combo, Flood, Wide Flood, or Elliptical beams. Each of these beam patterns is also available in a variety of tints, including amber, red, blue, or clear. A Black Out “Vision X” logo cover is also available for added protection when your lights are not in use. All covers are created from a high-grade polycarbonate material that adds some extra protection to your Snow Plow Light Kit.

So I'm going to be making my trailer lights wireless and battery operated with solar charging so I will never have to worry about crappy wiring etc etc all over the trailer and/or a dangling cable out the back.

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i was going to take those and optocoupler them to bring them down to 3.3V and take the running light one and also use it to power the ESP32. So when the car comes on so does the ESP32. The esp32 will be read on the 4 pins to detect when the car wants certain lights to fire..

ESP32 is a series of low cost, low power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. The ESP32 series employs either a Tensilica Xtensa LX6, Xtensa LX7 or a RiscV processor, and both dual-core and single-core variations are available. It includes in-built antenna switches, RF balun, power amplifier, low-noise receive amplifier, filters, and power management modules as well.