Where is the ac/dc switch for my 2002 fleetwood wilderness22C

I am not a sewing machine expert. As far as I know all sewing machines have a reverse "gear" for sewing in both directions and most commonly was a linkage that reversed the direction of the cloth feed dog.
The old hand or treadle operated machines could be reversed simply by the operator turning the handle in reverse...

I know nothing about modern sewing machines but I wouldn't be surprised to discover the traditional AC motor and rheostat has been replaced by a reversible DC motor with electronic speed control as is currently fashionable with everything from cordless drills to washing machines. If this is the case, reverse "gear" would be by a switch reversing the polarity of the current supplied to the motor.

I think you need to do a little research to discover how your machine should work before you begin asking why it doesn't work.

is this a sewing machine?

Fleetwood sewing machine threading Google Search

120 volts A/C. be very careful

These instructions apply to PFAFF 1475 CD. They may also work for other machines.
If you have some advanced electronic repair skills and tools, check the following:
For 220 Volts models - there is a fuse next to the power input, make sure it is good. There is no such a fuse for 120 Volts model.
If the fuse is Okay, you have to get access to the main circuit board by removing the bottom cover.
Check the primary on the transformer for 120 V AC (220 V AC respectively). Check the secondary side for 5 V AC (luminescent display), 9 V AC (turns to 5 V DC by rectifier, 4700 micro farads capacitor and a 5 V regulator STI L387A) and 28 V AC (turns to 35 V DC by rectifier and 2200 micro farads capacitor.
Pay attention to two soldered round fuses in series with the secondary 9 V and 28 V - both should be good. On the big capacitors you should have 9 V DC and 35 V DC.
Common symptoms for bad small 22 micro farads capacitors next to the some of the IC's - there are 5 of these: These capacitors are in parallel with 5 V DC.
## All of the LEDs light up but the display is blank
## All of the LEDs light up, the display is blank, and after a minute no LEDs at all
## No LEDs nor display.
Replace ALL five 22 micro farads capacitors using a good desoldering pump or desoldering station!.
Enjoy your resurrected PFAFF 1475 CD machine!!!
I just did this procedure on my aunt's one (Made in West Germany around 1990).

You'll find some instructions here. If you want the actual printed manual, I'm afraid you're going to have to pay to get it from here.

On the singer website on the home page look for
Instruction manuals at the bottom of the page-click on it
Put in your model number & click search

Call Euro-pro at 1-800-798-7395, they are the main company for Shark.

You need to check the fuses first with a continuity tester then the 12v DC out at the edge of the PCB, if you can read 12vdc then you have a component failure if not then the rectifier has popped.

(The AC transformer supplies an AC output of say 16v and it is then rectified and smoothed before going to the pcb)

If you have had the same backup battery in for more than 3 years it may have popped that circuit