You may have 2 problems. Killing the battery would suggest a short. When I have rewired something, the first thing I do before hooking up the battery is to put an ohm meter to the battery cables. With everything off, and assuming no shorts, you should have infinite ohms or lack of continuity. Or you can hook up one cable and drag the other across the post and in weak light you might see a spark. I just don't want to have an electric fire and burn up an expensive harness. If you have a short somewhere, then you have to find which circuit(s) might be involved.
The second issue relates to the wrong lights coming on. You could have mixed wires up, the switch may be bad or the harness is wrong. Only you know what items are new to your truck and which have been used before and proven to be good. For example if your switch worked before, it is highly unlikely that it is the problem.
