Hi, My 99 F150 Has started to blow the #21 start fuse under the dash. But, only sometimes. It can go up to 15 starts sometimes and then turn the key to start and I hear the fuse pop. I unplugged the pigtail wire from the solenoid to isolate it and then jumped with a screwdriver for a while and finally popped another fuse so I figure the problem is after the ignition switch but before the solenoid. My neighbor laughs every time I start it up with the screwdriver. Wait 'till he has trouble... Has anybody had this problem or know what it could be???

Any help is appreciated. Thanks

99 F150 XLT
5.4 Auto
4X4 Supercab