Trailer running lites not working
Thread Starter
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Trailering
Joined: Oct 2011
Posts: 24
Likes: 1
Trailer running lites not working
I have a 2019 f250 with the factory installed towing package and brake controller.
The running light circuit is not powered up.
I have stop and turn signals working but no running lights.
I verified that I don't have power on either the 4 flat or the round plug
The lights work fine on the truck but not on the trailer
Checked all the fuses and they were all good.
Any ideas on what else I can check to get them working
The running light circuit is not powered up.
I have stop and turn signals working but no running lights.
I verified that I don't have power on either the 4 flat or the round plug
The lights work fine on the truck but not on the trailer
Checked all the fuses and they were all good.
Any ideas on what else I can check to get them working
Thread Starter
|
Trailering
Joined: Oct 2011
Posts: 24
Likes: 1
Trailer running lites not working
I have a 2019 f250 with the factory installed towing package and brake controller.
The running light circuit is not powered up.
I have stop and turn signals working but no running lights.
I verified that I don't have power on either the 4 flat or the round plug
The lights work fine on the truck but not on the trailer
Checked all the fuses and they were all good.
Any ideas on what else I can check to get them working
The running light circuit is not powered up.
I have stop and turn signals working but no running lights.
I verified that I don't have power on either the 4 flat or the round plug
The lights work fine on the truck but not on the trailer
Checked all the fuses and they were all good.
Any ideas on what else I can check to get them working
Lead Driver
Joined: Jan 2002
Posts: 8,653
Likes: 4,739
From: Itinerant
I have a 2019 f250 with the factory installed towing package and brake controller.
The running light circuit is not powered up.
I have stop and turn signals working but no running lights.
I verified that I don't have power on either the 4 flat or the round plug
The lights work fine on the truck but not on the trailer
Checked all the fuses and they were all good.
Any ideas on what else I can check to get them working
The running light circuit is not powered up.
I have stop and turn signals working but no running lights.
I verified that I don't have power on either the 4 flat or the round plug
The lights work fine on the truck but not on the trailer
Checked all the fuses and they were all good.
Any ideas on what else I can check to get them working
Hotshot
Joined: Oct 2015
Posts: 19,698
Likes: 12,824
From: Wyoming
Which fuses did you check? From the 2017 Owner's Manual:
Check fuses #42 and #65. Those are listed as Trailer Tow Lighting Module.
#72 is turn signals and brake lights.
#84 is trailer backup lights.
#99 is trailer parking lamps.
Try it with another trailer to rule out that it's the truck. It probably is the truck since you said you didn't find power on the 7-pin or 4-pin.
Check fuses #42 and #65. Those are listed as Trailer Tow Lighting Module.
#72 is turn signals and brake lights.
#84 is trailer backup lights.
#99 is trailer parking lamps.
Try it with another trailer to rule out that it's the truck. It probably is the truck since you said you didn't find power on the 7-pin or 4-pin.
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
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Tuned
Joined: Jul 2005
Posts: 424
Likes: 70
From: Somerset NJ
I recently had the same issue with my 2018. When you say you "checked the fuses", what exactly did you do?
I used a continuity tester and it said I had continuity across the fuses. One of those cheap 7 pin testers from amazon showed everything OK.
When I used a volt meter, it said I only had 3 volts at the 7 pin for the running lights. I replaced the fuse with a new one and everything has worked since.
I used a continuity tester and it said I had continuity across the fuses. One of those cheap 7 pin testers from amazon showed everything OK.
When I used a volt meter, it said I only had 3 volts at the 7 pin for the running lights. I replaced the fuse with a new one and everything has worked since.
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Mountain Pass
Joined: Sep 2017
Posts: 158
Likes: 30
Have you tried turning headlight switch to on not auto? Running lights not powered during daylight when on auto. Those of use with backup cameras on RV's have to set our switch to on to power back up camera that run off of running lights circuit.
Fleet Mechanic
Joined: Mar 2021
Posts: 1,454
Likes: 606
FYI, for you to keep in the back of your head
Post 5
https://www.ford-trucks.com/forums/1...on-t-work.html
Post 5
https://www.ford-trucks.com/forums/1...on-t-work.html