Running light on trailer
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New User
Joined: Nov 2017
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Running light on trailer
I have an 2016 F-250 Super duty Ford. My running lights on trailer don't work. My break stop and singles works fine. I looking where and what fuse number should I be looking for.
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 118
From: Tallassee, ALabama
Have you checked your owner's manual? It lists the fuses in the Fuse Chapter.
You can download a copy here.
https://owner.ford.com/tools/account...h-results.html
check page 223 for the Battery Junction Box (BJB) fuses and relays.
check page 228 for the BCM fuses.
You can download a copy here.
https://owner.ford.com/tools/account...h-results.html
check page 223 for the Battery Junction Box (BJB) fuses and relays.
check page 228 for the BCM fuses.
Senior User
Joined: May 2012
Posts: 164
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If it’s not your fuse....check the seal on the plastic harness. Had the same issue 2 weeks ago and the clip that holds the harness in had broken and everything was corroded. Had to replace the entire harness and whip with the connector.
Thread Starter
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New User
Joined: Nov 2017
Posts: 4
Likes: 0
Have you checked your owner's manual? It lists the fuses in the Fuse Chapter.
You can download a copy here.
https://owner.ford.com/tools/account...h-results.html
check page 223 for the Battery Junction Box (BJB) fuses and relays.
check page 228 for the BCM fuses.
You can download a copy here.
https://owner.ford.com/tools/account...h-results.html
check page 223 for the Battery Junction Box (BJB) fuses and relays.
check page 228 for the BCM fuses.
Thread Starter
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New User
Joined: Nov 2017
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It's all new wires and harness. I have 12 volts on my break and single light at my truck but not getting any voltage for my running lights.
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 118
From: Tallassee, ALabama
Check these fuses. Some may pertain to the problem, some might not.
BJB
#10 - 40a
#26 - 30a
#70 - 10a
#90 - 25a
BCM
#15 - 15a
#30 - 15a
BJB
#10 - 40a
#26 - 30a
#70 - 10a
#90 - 25a
BCM
#15 - 15a
#30 - 15a
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Hotshot
Joined: Oct 2006
Posts: 10,146
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From: Texas
The first place I look when trailer lights act weird.........check all GROUND connections.
Laughing Gas
Joined: May 2017
Posts: 969
Likes: 30
Originally Posted by KeithClark
yes I did but nowhere for running lights for a trailer. I check all that had a trailer. It could be listed another way.
Postmaster
Joined: Nov 2003
Posts: 3,595
Likes: 0
From: Utah County, UT
To the OP, is this still an issue or resolved? If still an issue are you measuring with volt meter or going off what trailer lights are doing? Do you have another trailer you could use for testing? Is this the only trailer you have hooked up on this vehicle thus far? Only addition is to check for a relay 29, is it there, if so I’d swap with 30 or 31.
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