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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...
Attached Images
File Type: jpg trailer_3.jpg (43.0 KB, 11 views)
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Old 07-22-2014, 06:44 AM   #11
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Here is the socket layout...
Thanks for putting that up. I was going to do it last night but I was on the wrong PC. I didn't have the pic in that one.
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Old 07-22-2014, 09:02 AM   #12
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When I attach the wire I'll use a temporary tap to see how it works. If it works, I'll make a permanent connection and water proof it.

Thanks again for all the help.
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Old 07-22-2014, 10:20 AM   #13
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Unrelated sidebar:

On the trailer pigtail, a standard automotive fuse can be used to jump running lights and battery - making them light up at night.
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Old 07-22-2014, 10:31 AM   #14
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Unrelated sidebar:

On the trailer pigtail, a standard automotive fuse can be used to jump running lights and battery - making them light up at night.

Very cool. Pix?
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Old 07-22-2014, 06:12 PM   #15
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Just tap into your license plate light. It's just next to where you want to place your 3 light bar and it only operates when your lights are turned on. A simple connection and you're done.
No need for messing with your 7 pin.
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Old 07-22-2014, 09:16 PM   #16
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The bar includes turn signals, sequential amber indicators, taillights, reverse lights, running lights and hazards. So it has to be powered all the time the truck is turned on, not just when the lights are on.
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Old 07-22-2014, 09:26 PM   #17
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Mark5w, I'm curious about that light bar. Do you have a website link by chance?
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Old 07-22-2014, 09:28 PM   #18
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Mark5w, I'm curious about that light bar. Do you have a website link by chance?

Here's the web page: http://www.autoanything.com/lights/74A6218A0A0.aspx
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Old 07-23-2014, 07:03 PM   #19
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Looking at the functions, you should have 3 powering wires and a ground.
If you have a separate 4 pin connector besides your 7 pin as many vehicles do, just hook into this to simplify. One is left turn, one is right turn, one is running lights, and the last one is ground.
Stop lights work through the turn signal connections.
If not, just use those same connections on the 7 way and you're set.

You won't use the HOT line in the 7 pin you asked about. That connector doesn't affect the lighting system.
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Old 07-23-2014, 08:12 PM   #20
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Must be an industry standard - same on a Chevy:
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