As said in the dual battery kit description, a 6000 lbs winch can pull up to 300 amps when at its maximum pulling power! That is a whole lot to ask from the wiring and the battery! So we have developed a kit which limits how much it can actually pull for maintaining the battery life over time. Our kit has a re-settable breaker rated at 150 amps. If you go over that, just push the breaker closed again and keep going. This kit also has the correct wire gauge for carrying that amount of power. This kit has everything you need to do the installation including wire and terminated ends. Please specify which machine you have for proper wire length to be included.