2009-2014 FORD F-150 WILL CRANK BUT NOT START: FUSE 27

Parked my truck and the next day it would not start. Turned the key and it would just crank but would not hit. All my problems were solved with a little 50 cent fuse. The problem was fuse #27 had arced and was fired. Replaced it with another 20 amp fuse and truck started right up!
Fuses I got at Wal-Mart:
Bussmann Series 6 Piece ATM / Mini Low Profile Fuse Assortment Kit, Multi-color, 32 V, BP/ATM-A6LPRP