I have a 2010 ford focus, I've had it for about 2 years and I've never had to fix anything on this car. Then one day, I went to walmart, went inside for about 30 minutes or so, and when I came back out and tried to start the car the ignition fuse blew so i put another one in and it started no problem for awhile. Then again one day it decides to blow out of nowhere, i put another in and it blew again immediately, I put a 30 amp in (usually it's a 20) just so I can get it home and it started, ever since then it's been sitting, it's been about 2 weeks. I replaced the starter and checked some of the wiring. I tried to start it after I replaced the starter and it blew again. Then the other day i decided to try it the other day just for shots and giggles, surprisingly it worked, I turned it on and off about 20 times and it didnt blow the fuse, so then I test drove it to walmart where it blew on me again. I drove it home turned it off and it worked, I've been driving it to work and back and to the store all week and it hasn't blown another since. I'm at a loss here on what it could be. Any suggestions?