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Old 12-26-2013, 12:05 PM   #1
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F-150 7 pin connector battery charging

I have an F-150 Lariat with the Trailer Tow Package. I read somewhere that unless things were hooked up by the dealer the truck came from the factory without the connection to charge the battery from the 7 pin connector. I checked my dealer and they never heard this. Can anyone confirm this or has had to do it?
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Old 12-26-2013, 01:17 PM   #2
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This was the case with the HD Tow Package option. There is a relay and fuse that gets installed in the panel mounted in the front of the engine compartment just behind the radiator. Just about everyone I know that purchased the HD Tow Package found their relay and fuse in the glove box. Why, I have no clue. If you do not have 12 VDC at your 7 pin plug (while ignition is on) Ford probably did not install the parts.
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Old 12-26-2013, 01:38 PM   #3
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How do I check this? I do not have an hd package but did have 3 parts in plastic bags as extras. I stupidly threw one away
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Old 12-26-2013, 04:25 PM   #4
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With a multi meter you can check for current on the pins.
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Old 12-26-2013, 06:27 PM   #5
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Quote:
Originally Posted by jamaddox View Post
How do I check this? I do not have an hd package but did have 3 parts in plastic bags as extras. I stupidly threw one away
With a multi tester or a 12 volt test light. Leave the truck switch on or the truck running while you perform the test. Get a good ground off of the frame or a clean bolt near the truck plug. The terminal that is just to the right of the cut out notch in your plug is the hot wire that feeds your trailer. It will only be hot when the ignition switch is on.
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Old 12-26-2013, 06:54 PM   #6
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Here is a picture of the pin-out.
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Old 12-26-2013, 07:13 PM   #7
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Great thanks for the help. I have a multimeter but not used it as for now I am apparently electrically challenged. I have to read the multimeter manual
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Old 12-26-2013, 09:12 PM   #8
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Fords aren't the only trucks like that. On my Tahoe I had to connect a wire near the fuse box to make my 12V terminal live also. I don't understand why they just don't make the connection at the factory. What would it hurt.
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Old 12-27-2013, 05:13 AM   #9
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You should have a baggie in the glove box with a fuse and a relay in it. They go in positions 9 and 21 on the power distribution box that sits above the radiator when the hood is open. You must install them before towing if you want 12v at the 7-pin connector. I install mine in May and remove them in November as I learned on the F150forum.com that having voltage on the pin(s) will increase the likelihood of galvanic corrosion on them over time.

The other loose item you should find in the glovebox is a protective cap for the rear camera wiring harness (if you have the rear camera option). I use that one too as I remove my tailgate for the salty months...November through May.

Why remove my tailgate? Well, years ago I had an '85 Ranger and left my tailgate on year round. The tailgate lasted 6 years and was nearly disintegrated. Additionally, I have the camera in my tailgate and although they are designed to be weather resistant, I really don't have faith that they are designed to perform for the next 15 years without some kind of special treatment.
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Old 12-27-2013, 07:34 AM   #10
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Check your manual and look for TRAILER TOW fuse and relay in the fuse panel mount over the radiator. That is where my 2010 fuse and relay had to be installed.. It seems to me my TRUCK battery charge DC voltage showed up on PIN 2 of the 7-way trailer connector when the iginition key was turned on with the fuse and relay installed... Your trailer side battery 12VDC voltage should also be on PIN 2 of the7-way trailer connector.

My extra package in the glove box had one fuse and one black relay relay in an unmarked plastic package in the glove box. I just checked and on my 2010 F150 FORD Truck the relay goes in position #9 and the fuse goes in position #21 in the power distribution box (fuse box) in the engine compartment mounted above the radiator.

My 2010 F150 truck did come with the trailer tow package with the built-in BRAKE CONTROLLER installed in the dash.
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