Drivers seat switch that moves the seat forward & back as started to work in reverse sometimes, not always. It will also go fully forward however only half way back. any advise?

I doubt the motor is the problem if it goes back the motor wont be the problem , have a look in the seat tracks something has probably lodged in the track

check for the release wire fully releasing the lock on that side. when you pull on the release lever it is to pull both release locks so the seat will move.

sounds like you might have a switch problem if the memory for seat position works ok. If you have a multimeter that checks for continuity then you could start there at the switch but you would also need a wiring diagram for the seats

The power seat in the truck has 3 motors, one of them is not working, the most common cause of this is the power seat switch is defective, it is often the forward and reverse seat positioning switch that fails because it is the one that is most used. If the switch checks ok then you will need to replace the the power seat track assembly, Ford does not sell any parts for the track, it is only available as one complete unit, I know this because i retired form a Ford dealer. Please rate my help for Fixya. Thanks

The control module for that is 400 dollars and the switch is 110.

I just went through and determined it was the switch. My wife had accidentally moved the seat almost all of the way forward - and the reverse did not work at all - she was very cramped. After going thru fuses and seeing that none were blown I looked for loose wiring under the seat and found none. I was about to pull the seat when I stopped and decide to pull the side cover first. Item 5 in the photo below. Once that was off access to the switch was easy - item 3. The box actually contains a set of 3 switch housings each with 2 switches on it - total of 6 for each direction. I unplugged the large connector to this switch. Then I cut some wire off of a roll of wire i had in the garage and stripped both ends. I put one wire into the power contact (red) and the other into ground (black) and then took the other end of both wires and connected them across the other contacts in the connector. Pretty quickly I could determine which pair of contacts controlled which motor. I got the right combination that allowed me to operate the seat-reverse motor and get the seat back into the right position... problem solved. I still need to find a replacement switch box at a junk yard but no hurry now that the seat is back to a comfortable position.

One of two options: You have a bad seat position switch, or you have a bad seat motor. Use a digital multi-meter and backprobe to check for voltage at the motor when the seat switch is moved to the "reverse" position. If you have voltage, you have a bad motor. If you do NOT have voltage, replace the switch.

it sound like you need to replace seat control switch

the problem is the switch, replace it.

My intuition tells me that the 6 way power seat track forward / reverse motor is bad. Sometimes you can replace just the one motor but most often a whole new power seat track is the only way to repair. It is not too bad to replace but the seat will have to be removed from the car and placed upside down to access the track assy. There are 2 bolts in the front of the seat and 2 bolts in the back of the seat that hold it down to the floorboard. Once it is loose you can rock the seat backwards to access and unplug the electrical connectors.