I have a 99 f-150 the anti theft light blinks after truck is switched off. Youhave to wiggle the key to turn switch on. Any help with this. Thanks

 

I'm not sure what you mean. The anti-theft light is supposed to blink when the truck is off. It's to scare away theifs.

 

Ok I did'n know that! So maybe I was worred over nothing. Thanks

 

If you have to wiggle the key to get the ignition switch to OFF, the cylinder is wearing out. Lube it with a proper lock lube to extend its remaining life. Replace it before it fails completely or else the repair becomes a LOT harder.

Steve