was looking at my trailer wires and found them to be brittle. I new at purchase I would be installing led lights. Was hoping to not need to rewire everything.

I have a 9 wire plug on the trailer, can I replace that with a conventional 5 wire set?(couldn’t find anything online) and tie the lights in accordingly.
I have replaced one light thus far and found the lower light bar is tied into the running light off the tail lights.

I also may note that I have surge brakes. Don’t see anything that should be tied in to that.

thanks