Lots of info on the 7-way connectors and diagrams can be found on ETRAILER.com
They also have some good U-TUBEs on the subject...
It could be you have a secondary fuse panel just for the 7-way connections... My 2010 Ford has fuse panels right in front of the Radiator, then one on the kick panel inside the truck passenger side, then another panel under the dash near the drivers side...
Be mindful you will only see 12VDC on the connections when a function has been engaged with the exception of one 12VDC connections that always be hot (with the ignition key ON in my case)
Also my 7-way and 4-way spring loaded door lids have pin-out readings on it...
My 2010 Ford truck also has the TOW PACKAGE which includes ignition control over the 12VDC being presented to the 7-way connector. The truck ignition key has to be engaged before i see 12VDC at the 7-way connector... this is controlled with a ATC fuse and RELAY installed in the main breaker panel under the hood in front of the radiator...
Good info on all of this on the ETRAILER.com site... Your truck manual should also show you where all of the 12VDC panels are located... The magic words for the 7-way and 4-way connectors is usually called TRAILER TOW or something like that...
I have one of these portable 7-way connector test unit that is really handy when troubleshooting 7-way connections and functions. this plugs into the truck 7-way connector and operates small led lights as you do the functions... If this test unit works normal when plugged into your 7-way truck connector then the problem is on the trailer side...
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Roy Ken
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