Have a 2005 f150 that sat for 3 years or so. The wipers start “some times” but immediately return to the home position. They move for maybe 1/10th of a second moving maybe 1/8” at the most. I replaced the turn signal, dimmer, wiper combo switch and nothing changes. Washer fluid sprays ect. Everything works as it should just not the wipers. Tried yanking on the wiper while they are turned on and no results, felt as if they were welded in place. They act like if you can imagine a cotter pin was placed in between the next set of teeth to engage causing everything to stop then returning to home. Only thing I can figure now is the wiper motor is bad. Going to try to see if motor linkage arms are seized next I guess then try disconnecting linkage to see if motor will operate as designed. Anyone ever run into this problem? Thanks.