I have a 1997 F150, I started having problems with the blinkers not working , or not staying on if they did work, we thought it was the multifunction switch so replaced it, that did not fix it. Well a few days ago I noticed I didn't have brake lights, so we started troubleshooting everything I could find on here, and anywhere else I could find any information. We were able to figure out the cab brake light works, and we have power everywhere but at the bigger wire harness that connects to the multifunction switch. Tonight I noticed I had brake lights, out of nowhere, however out of habit I turned the blinker on and it made the brake light go off. What is going on?!?! I'm going crazy at this point!!

 

Try this schematic and see if you can find your problem. When I had my problem, I found my problem in the power distribution box. Did you check those fuses also, besides the dash fuse panel?

 

Ok thank you so much! I have to go to work then will check it when I get back. We had not checked that box, didn't think about it when we had power everywhere but that one wire harness.