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Old 07-21-2014, 04:52 PM   #1
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Hot wire on 7 pin plug

I have a '13 F 150 SCREW. Is there a hot pin on the 7 pin connector that is hot even when the truck is turned off? Which pin is hot when ignition is on?

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Old 07-21-2014, 05:30 PM   #2
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I was curious when I saw this post. First you are very internet savy, and I was interested in the info. I searched and found I could not find a definative answer. I imagined you had a similiar experience. So now I am most curious and will follow this thread.
Chime in please.
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Old 07-21-2014, 05:56 PM   #3
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You peaked my curiosity so I grabbed my multimeter and went out to my truck. In fairness I have a 2010 f250 but I'm sure most all are wired similarly. The 12 volt pin (pin #4) is constant 12 volts only when the switch is on. The other pins for the lights work same as the truck lights do (ie flashers work regardless of if the switch is on or not).
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Old 07-21-2014, 06:48 PM   #4
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There is not a constant energized 12 volt pin with the vehicle off as that would lead to many dead tow vehicle batteries. We wouldn't want that, I'm sure! Pin #4 is energized with vehicle switch on and normally used for battery charging.
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Old 07-21-2014, 07:01 PM   #5
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If you need an always hot connector like I did for my horse trailer interior lights you could do what I did and take the center pin which is for back up lights, which most trailers don't have, and wire it to always be on.
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Old 07-21-2014, 07:41 PM   #6
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As you look at the front of the plug--(plug facing you)
The hot/battery power lead would be the one immediately just right of the top.
Like all have stated, it's only hot when the ignition switch is on.

Check it out with a multi meter some time when you think of it.
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Old 07-21-2014, 07:41 PM   #7
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I am trying to wire a led tail light bar.



It says to run hot wire to battery. I thought it might be easier to tap into the 7 pin connector.
Thanks for all the help.
When I get back from camping I'll see what I can do.
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Old 07-21-2014, 07:45 PM   #8
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Tail light would be the one on the left of the top when looking at the plug.
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Old 07-21-2014, 07:58 PM   #9
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The tail lights, turn signals, and brake lights plug into the 4 pin plug of the truck. So the wire I have to tap is a hot wire and run another up to the back up lights wire.
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Old 07-21-2014, 08:23 PM   #10
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Here is the socket layout...
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File Type: jpg trailer_3.jpg (43.0 KB, 10 views)
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