I have a quick question. I am installing a solar system into the passthrough compartment in my 5th wheel. I know I need to run a wire from the lynx distributor to the 12v connections in the front bay to enable the 12v lights, hydraulic levelers and the slides. Going to connect to the current breaker that is there. I am also going to ground the lynx to the frame close to the install site in the pass through. Do i need to run both positive and negative to the front compartment? or can I just run the one positive wire and count on the current frame ground in the front compartment to be the negative?