More likely to be a main wire off or forgotten at battery.
Ford have a habit of using a red wire with a black sheath around it which sometimes mistakenly gets put on the neg instead of pos, worth a look.
If not just follow power route along from battery and you may find an immobiliser in the circuit ?
If not make sure power is reaching ignition sw and PCR in fuse box.
tabetha
ps I had to ask the obvious no offence was intended, it is sometimes hard to determine peoples ability please do not take offence as none intended.