THEFT light blinking after install

[RobbyMartin]

Originally Posted by XPerties

Just a shot in the dark but since you removed a power source maybe when you hooked the battery back up it reset.

Have you tried to program back to stock and then reprogram back to your custom tune?

I did an engine swap going from a 4.6 to a 5.4 and Bill wrote a stock for the truck to think it was a 5.4 then he wrote the custom tunes for the 5.4. So the stock tune is also written by Bill.