[NotmyBfrndsTruck]

So I have a 1999.5 F250 7.3. About 2 weeks ago I noticed that when I was driving it and used the turn signals, the driver side is fine but the right or passenger side blinker comes on but does not blink. Just solid on. Now, the emergency flashers work. Inside and out. Ok so I switched out the flasher relay behind the dash. Went through the ash tray. No improvement. So I bought and replaced the multi function switch (with the turn signals and high beams I think?) Anyway, still no improvement. Still on- no flash.
Side note: around the same time as the flasher issue arose, I decided to remove the old set of fog lights that have not worked in ages. I found that the way that they were powered was to attach them with a pinch connection to one of the headlight wires--on the same side as my current issue. I removed the pinch connection and taped it up. Might that be related? Tyia!

 

[Coyt Wiggins]

It might have been a secondary ground wire but haven't ever heard this problem before.. @klhansen might be able to give u a better idea but thats what i think

 

[NotmyBfrndsTruck]

It might have been a secondary ground wire but haven't ever heard this problem before.. @klhansen might be able to give u a better idea but thats what i think

Something I found today.... I decided to check the fuse for the turn signal. #1 fuse. Pulled it. Fuse is fine but... The turn signal that is acting up comes on! Stays on. Like it has been doing. The left signal does nothing, like I would think it should with the fuse pulled. So! What the heck does that mean? That it's on another circuit? I was going to start pulling fuses to see if any of them affect the staying on turn signal. But I don't know if that's a good idea. I'd do them one at a time obviously. But still. I'm pretty sure I caused this somehow when I removed the old fog lights but I don't know how😢

 

[klhansen]

Fuse #1 is the power for the flasher relay, not the lights themselves.

Here are some wiring diagrams that might help you, they're from '01 but should be the same as your truck.

 

[NotmyBfrndsTruck]

Fuse #1 is the power for the flasher relay, not the lights themselves.

Here are some wiring diagrams that might help you, they're from '01 but should be the same as your truck.

Thanks. My phone is having a hard time with those files but I will try the computer.
Is there another fuse for the lights and not the relay?
I also checked and the trailer connection is doing the same thing. Meaning that if the truck is connected to the my trailer, the turn signal comes on but doesn't flash.
Thank you very much for the info.