With a hard failure like you have (blowing fuses), it's easier to isolate and identify the problem ....versus if you had an intermitent problem. I would suggest getting your hands on a set of electrical schematics for your vehicle, and find out what all is on that circuit. Disconnect everything you can from the circuit, then put a new fuse in and see if it still blows (which means something you didn't disconnect), or not. If it didn't, turn off the vehicle, plug in a couple things, turn back on and see if it blows. Through a process of elimination you will zero in on what is bad.
You might try helminc.com to see if they have your yr/model of factory service manuals, if so they have a deal that for like 2 or 3 days of online access (which you can print what you need on your printer), it's very reasonably priced (like under 20 bucks if I remember correctly).