If you have the twilight sentinel, does the fuse blow only when you turn them on manually, or does it also do it when they come on automatically? One thing I used to do with electronics servicing is to replace the fuse with a light bulb. If it lights brightly, there is a short somewhere. Some things may come on, but dimly. If they do, that part is probably ok, and you can check out other areas. If nothing does, you can try disconnecting different things and see if the light goes out, or dims considerably. If it does, then you're in the right area.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.