Hello viccook. It sounds like you have a short. A wire that is touching a ground, in that circut. If you don't know every thing that is on that circut, you'll will have to get a wiring diagram. make a jumper wire, with a light bulb in it, to replace the fuse. Disconect, or turn off every thing on that circut. Plug in your jumper wire. Wiggle the wires when the light comes on, you will know were your short is.
Dave