Before you begin making any connections you need to be sure you have the correct cables. You are correct in your description of how to wire in a new auxiliary battery in your enclosed trailer.
How To Install A Dual Battery System Into Your 4x4 Sa4x4
Wiring an auxiliary battery. You will take the 7 ways 12v power feed and route this to the positive terminal on the auxiliary battery and you will ground the second battery to the trailer frame as you described. There are several ways to wire your winch depending on whether your winch is mounted on a vehicle or a trailer the type of winching and the frequency of winching. Use a voltmeter to check for current from the black wire in the seven pin electrical outlet at the back of your towing vehicle. Turn off your vehicle. Step 2 figure out where your auxiliary battery will be mounted. The 6 bs cable is about 550 per mtr and you need enough red and black to run between both batteries.
To provide power to a winch it must be wired to a vehicle battery or a separate auxiliary battery designated for use with the winch. How to wire a trailer to charge the trailer battery. Under the hood is best if you have room. The less cable you have between your. Install the correct fuses in. How to wire an auxiliary battery step 1.
The larger cable above is the minimum size required 6 bs 135mm² and matching lug note the wire above it thats the 6mm 459mm² auto cable used by many to do the job its just not up to the task it at all. Electric winches require power from a battery source to operate. Step 1 disconnect your starting battery from the system by removing the positive wire from the battery terminal. For safety and efficiency you need to have flat clean and smooth connections. Setting up a dual battery system is easy.