Which Fuse In 2013 Ford F-150 Controls Trailer Turn Signals?

Updated 09/04/2025 | Published 10/09/2021

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Question:

I had to get a new 4 connecter on my trailer and as I was trouble shooting I shorted the trailer turn signals. Previously my right and left trailer signals worked. Now they don’t. I checked the turn signals with my light tester and there is no power coming from the truck. I checked the relays under the hood and they seem fine. Is there another fuse I can check? Thanks

asked by: Matt T

Expert Reply:

Since the trailer connector on your 2013 Ford F-150 is no longer sending power to the turn signal circuits on your trailer you will need to replace fuse # 73. This 20-amp fuse is located in the engine bay fuse box and is what sends power to the trailer turn signals and is what would have blown when you accidently shorted the trailer turn signals.

You will want to use a circuit tester like # PTW2993 to test each side of the fuse to verify if power is making it through or not as some times a fuse will look ok but actually isn't.

expert reply by: Samuel C

Brian

2/22/2024

You nailed it! I examined the items marked right and left turn signals but did not know where else to look. Thanks so much.

Mike L.

2/22/2024

@Brian Hope you got it all fixed up, please let us know!

Paul

6/17/2024

@MikeL I changed fuse number 73 and the engine compartment but still have no power to my trailer connector any more suggestions

Paul

6/17/2024

I checked and I do have power to the fuse on both sides in the engine compartment. I accidentally knocked the plastic cap off of a fuse when I was changing it so I was able to put a circuit tester inside and check both sides

See All (12) Replies to Brian ∨

Paul A.

5/5/2024

My Fuse #73 has blown a second time on my 2013 F-150. What would be the most likely cause of blowing this fuse more than once? Would the cause more likely be a problem with the trailer or a problem with the truck? I can replace the fuse but worried it’s just going to blow again. - Thanks

Kevin C.

5/22/2024

@PaulA If a fuse repeatedly blows it means you have a short somewhere in your wiring. More likely it's on the trailer because the wiring on the truck is better protected from the elements so I'd start by tracing the wiring on the trailer and looking for any damaged or brittle wiring and replace as needed.

There ?.

8/14/2024

There are no fuse in 73

Samuel C.

8/14/2024

@There? If there's no Fuse 73 on your 2013 Ford F-150, then you're not going to get power to your trailer turn signals, and need to install a 20-amp fuse if you want your trailer circuits to work.

Joseph S.

9/3/2025

My brake lights and turn signal lights don't work on both of my trailers but trailor lights do

Jon G.

9/4/2025

@JosephS Did you mean to say but the running lights do? The brake and turn signals are on the same circuit. My guess is that you're using the same tow vehicle for this, so you'll want to check the brake and turn signal fuses on your tow vehicle as a starting point.