Most of the circuits in lawn and garden tractors use low amperage with the exception of the starting circuit. The wiring also only runs a short distance. I recommend using 6 AWG wire for the high amp starting circuit, and the negative side of the battery to common ground connection. All other wires can be 16 or 14 AWG. The easiest and most effective way to make all of the connections is by using nylon wire crimp connectors. Nylon wire crimp connectors are more durable than ones made from PVC. They are also easier to install than soldered connections. The most common crimp connectors you will use are spade and ring connectors.
This same principle can be applied if you wanted to build a rear fork lift, 3-point hitch, snow blade set up. Anything! Instead of using a hydraulic cylinder you can use a hydraulic motor and add a PTO shaft to power implements at any location you desire. You can also vary the motor speed by controlling the volume of oil that feeds it. All you need are the 4 basic hydraulic components of reservoir, pump, valve, and device.
The basic components in a hydraulic system are:1.) Reservoir 2.) Pump 3.) Valve 4.) Piston or Motor
This can be illustrated with this math formula: Force = Pressure x Area.So if we were to push liquid at 1,000 psi into a cylinder with an end area of 2 square inches we would produce 2,000 pounds of force. If we were to enlarge the end area by using a larger diameter hydraulic cylinder with a 4 square inch end area, we would produce 4,000 pounds of force. Since the displacement of the larger cylinder will be greater, our cylinder will move slower but with greater force. Like all other forms of mechanical advantage, we trade speed for power.