directional not working right
Thread Starter
|
Trailering
Joined: Mar 2021
Posts: 16
Likes: 0
directional not working right
I have a 2021 SD and the left directional is blinking 2 times as fast as the right. all the bulbs are lite and I don't have mirror lights. Can anyone explain this, that it only started a month ago.
Thanks for any help it just makes me wonder because something ain't right
Thanks for any help it just makes me wonder because something ain't right
Lead Driver
Joined: Oct 2014
Posts: 5,946
Likes: 1,359
From: NY/Canada border
Is the hyper flash only in the instrument cluster but the flash looks like normal speed from the outside? Something is telling the BCM that you have a low voltage situation I think.
Laughing Gas
Joined: Dec 2021
Posts: 1,098
Likes: 343
From: PG, BC, Canada
Trending Topics
Lead Driver
Joined: Oct 2014
Posts: 5,946
Likes: 1,359
From: NY/Canada border
He says in post #1 that he has no mirror lights.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Laughing Gas
Joined: Dec 2021
Posts: 1,098
Likes: 343
From: PG, BC, Canada
Well now... Mine has it and I may be wrong but I don't think that is an option... It's a "safety" thing, so... I still think he should check it again... JMO 
EDIT; I went out and checked mine and... From the front, all I could see was clearance lights, no flashing signal lights, from the side and rear I could see the signal lights flashing... So... if he he has clearance lights he should also have signal lights... and if he doesn't have clearance lights, then ignore my post...
EDIT; I went out and checked mine and... From the front, all I could see was clearance lights, no flashing signal lights, from the side and rear I could see the signal lights flashing... So... if he he has clearance lights he should also have signal lights... and if he doesn't have clearance lights, then ignore my post...
Tuned
Joined: Nov 2020
Posts: 356
Likes: 85
From: South Georgia
Check ‘em again
Check your taillights again on every function stop, turn and tail. Have someone do it while you watch. You’ll probably find that one of the four isn’t working on one function. I’ve read this a hundred times on here. Happened to me recently so first thing I checked and sure enough. This is assuming you have the incandescent 3157 bulbs.
Lead Driver
Joined: Oct 2014
Posts: 5,946
Likes: 1,359
From: NY/Canada border
Well now... Mine has it and I may be wrong but I don't think that is an option... It's a "safety" thing, so... I still think he should check it again... JMO
EDIT; I went out and checked mine and... From the front, all I could see was clearance lights, no flashing signal lights, from the side and rear I could see the signal lights flashing... So... if he he has clearance lights he should also have signal lights... and if he doesn't have clearance lights, then ignore my post...
EDIT; I went out and checked mine and... From the front, all I could see was clearance lights, no flashing signal lights, from the side and rear I could see the signal lights flashing... So... if he he has clearance lights he should also have signal lights... and if he doesn't have clearance lights, then ignore my post...
Lead Driver
Joined: Oct 2014
Posts: 5,946
Likes: 1,359
From: NY/Canada border
Check your taillights again on every function stop, turn and tail. Have someone do it while you watch. You’ll probably find that one of the four isn’t working on one function. I’ve read this a hundred times on here. Happened to me recently so first thing I checked and sure enough. This is assuming you have the incandescent 3157 bulbs.
Thread Starter
|
Trailering
Joined: Mar 2021
Posts: 16
Likes: 0
What I,m understanding is if all my lights are flashing at the correct speed and they're all lite it is an electrical problem and mite want the dealer to look at it. hope it is a warranted issue. does that make sense?
Fleet Mechanic
Joined: Mar 2021
Posts: 1,455
Likes: 607
Your dash will Hyper flash and the external lights will blink normal speed even when something is wrong, If you have halogen lights it could be a dual filament bulb (like your tail light/brake light) has 1 of the 2 filaments burnt in one of your bulbs. If all filaments in all bulbs are working it could be a loose connection or poor connection somewhere. The computer isn't seeing the electrical draw it expects and is telling you something is wrong by hyper flashing the dash only. Don't forget the 3rd brake light on the top of your cab.....
Tuned
Joined: Oct 1999
Posts: 320
Likes: 48
From: Eastern TN
PTT with A Rod has a video that talks about this issue. The problem was is with one of the trucks computers and he was able to correct the issue. So, I would guess you would need to take it to the dealer, but I would check out the video first, so when you talk to them you can help get the problem resolved.