Do you have a volt meter and/or test light and know how to use it? It's hard and/or inefficient to check electrical systems without some basic knowledge.
Start with the battery and trace the power towards the dash. When you no longer can verify battery voltage, you'll know where the problem is.
2012 JD855D OPS Black Poly Roof, Deluxe Cargo Box, Front and Rear Protection, Power Lift, Front Hood Rack, Rear Screen (homemade), 800 Watt Inverter, 2500lb Winch installed in cargo bed, Front and Rear LED auxiliary lighting (4" square 27 watt), Front and Rear CV Guards, Koplin Side Mirrors