ON MY 2000 LINCON TOWN CAR 120" STRETCH LIMO DRIVERS SEAT BACK WILL NOT COME UP MOTOR WILL STILL PUT IT BACK. SEAT WILL STILL GO FORWARD & AND BACK BUT NOT RAISE BUT CLICKS AS AT BOTTON OF TRAVEL. CHECKED FUSE 8 OK WHEN REMOVED KILLS ALL AS SHOULD

Try a simple trick I have used on many Volvos. You will need several paper towels and a can of WD40. With the ignition off soak the switch until it overflows with WD40 and work it in all it's directions for 5 minutes and repeat. The WD40 will clean the contacts which is the normal problem.

slide the seat all the way forward , this should reveal the bolts at the rear ,once removed slide seat all the way back then undo the front bolts

number 5 is one of the front plugs. look at the front of the 2 valve covers. one side is more forward than the other . the more forward bank is number one the other front plug is number 5

Two thoughts:
1; Your tires may not be correct for the vehicle. Look at the tire, get the ratings off of them, and look that up on the Michelin website. Your tires may not be able to handle the extra weight. The rating should be something like "Load Rating B" or something like that.
2: While looking at the tires, they should also tell you the minimum and maximum tire air pressure.

When facing the front of motor it is the first one on your right, meaning first one closest to air filter.

Call an autorecycler and ask them to find you a replacement seat. The doodads which make these car cost more have a short life span. If you want long life, stay with plain jane stuff. You need a new seat motor and a replacement used seat will cost less than a new seat motor and the cost to swap a seat in and out will cost less than the labor to take the seat out repair it and then put it back together.

Hi:
You should be able to use factory original airbags in your stretch limo, because of all the modifying is done in the middle/rear of the car, and the front part is still original, other than suspension upgrades.

Given, if ALL FUSES are good, then there must be a relay somewhere... (or a fusible link, which ford's were known for, ugh). Also, if there are two batteries, usually there's an isolation device that's used between the two batteries. One of the batteries might be dead, which you can get tested easily, or if not, I would examine that isolation device closer.

It is likely the gear on the motor came off track with the seat. The seat will have to be removed and bottom panel disassembled.