To begin with, wires to the side posts, a very bad idea! Side posts on a red top are internally connected to the top posts. Thin and will eventually fail. First thing to remember is that no matter what alternator you run, it will not run your winch at load. It will only replenish your battery faster. The red top doesn't like a fast charge, just will not accept it. Also, The red top is not the optimal(pun intended) winch battery. I have three, I speak from experience. If you cables have good connection and the terminals are clean, the battery is still probably your culprit. Another thing to remember is that the worst possible thing you can do to your winch motor, is starve it of power.