Ok guys so I have the 99 f150 5.4. Today I was working in my garage with my music on I have a kenwood deck with a 1000 watt fosgate and 2 12 inch p1s and I always do this. Today after 10 mins my subs cut out but the radio didn't then they came back on and then shut off for good. Didn't feel like messing with it so just left it alone. Went and got some Lunch came back to mess with it and went to start my truck and put it in the garage and it just clicked. I was like ok so I boosted it and started right up left it running a bit and when I went to mess with my subs I noticed my stereo was off no lights or anything. I'm thinking a fuse so I left it off closed everything up and went to go buy the fuse came back tried to start the truck and it's dead again and fuse was fine. Sorry for the long post. Any ideas anyone I'm stumped.