That sounds like an interlock problem. Don’t know about Ford chassis but some manufacturers include a bypass mechanism. Check your manual, it might be in there. Worth a look.
Here it is.
Do not drive your vehicle until you verify that the brake lamps are working.
If your brake lamps are not working properly or if you have disconnected the vehicle battery cables, the
vehicle brake lamps and hazard flashers may not properly warn traffic of a vehicle breakdown or approaching danger, which can increase the risk of serious injury or death. To minimize the risk of serious injury or death, be aware of your surroundings, use other hazard signaling devices if available, and move the vehicle to a safe location away from traffic as soon as possible.
When doing this procedure, you will be taking the vehicle out of park which means the vehicle can roll
freely. To avoid unwanted vehicle movement, always fully set the parking brake prior to doing this procedure. Use wheel chocks if appropriate.
If the parking brake is fully released, but the brake warning lamp remains illuminated, the brakes may not be
working properly. See your authorized dealer.
Your vehicle is equipped with a brake-shift interlock feature that prevents moving the gearshift lever from park (P) when the ignition is in the on position and the brake pedal is not pressed.
If you cannot move the gearshift lever out of park (P) position with the ignition in the on position and the brake pedal pressed, a malfunction may have occurred. It is possible that a fuse has blown or your vehicle’s brake lamps are not operating properly. See Fuse Specification Chart (page 65).
If the fuse is not blown and the brake lamps are working properly, the following procedure will allow you to move the gearshift lever from park (P):
1. Apply the parking brake. Turn key to the lock position, and then remove the key.
2. Disconnect the negative (black) battery cable from the battery.
3. Insert the key and turn to the off position. Shift the transmission to neutral (N).
4. Reconnect the negative (black) battery cable to the battery.
5. Start the vehicle.
Note: See your authorized dealer as soon as possible if this procedure is used.
If Your Vehicle Gets Stuck In Mud or Snow
Note: Do not rock your vehicle if the engine is not at normal operating temperature or damage to the transmission may occur.
Note: Do not rock your vehicle for more than a minute or damage to the transmission and tires may occur, or the engine may overheat.
If your vehicle gets stuck in mud or snow, you may rock it out by shifting between forward and reverse gears, stopping between shifts in a steady pattern. Press lightly on the accelerator in each gear.
2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2018 Jeep Recon