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Hi all....
'89 F150 5.0 .....rear blinkers and stop lights work, as do flashers. No "running" lights. Would this be a headlight switch problem? I took a good look under the truck at what I thought might be the most likely places where a break would be, but all wiring seems fine. Thanks in adavance.
Do you have dashboard lights?
If not check the topmost fuse in the box. I think it's #4
Sometimes the fusebox gets hot and the connections go bad on the back side.
Try playing with the switch between positions.
You may find a "sweet spot" that will verify it's the switch before you spend $60 on a non-returnable electrical item you didn't need.