I'm really surprised that you're blowing the fuse running only 189 watts. This is the first I've heard of it happening. I'm even more surprised that it's happening while your truck is running. Considering that your system is running at 14.4v while the truck is running, it definitely shouldn't be blowing the fuse.
The quick solution would be to use a wiring harness and relay and draw power from the battery and just connect with switch wire from the relay to the Aux 3 wire. However, I'm really surprised that you need to do that. I'd check that the Aux 3 relay is functioning properly, as well.
Ya agree, lol. Ive tested it out and the system is fine.. Its weird but it is what it is. The light is fine, the switches are fine, go figure.