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  1. #31
    Platinum Member sparc's Avatar
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    Oct 2011
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    NJ
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    JD 4410, NH TC-25, Bobcat M610, JD X534, Dig-It Model 158

    Default Re: truck battery dead after parking with trailer hooked up

    Quote Originally Posted by Diamondpilot View Post
    You are right, but this is only on the factory setups. Toyota and Nissan also did it right but GM took the cheap route and took out the relay. I have seen this more than one time.

    Chris
    Just to be clear for myself and my 2012 F-350, you are saying there is a relay that physically disconnects the power on all conductors in the trailer connection when thetruck ignition is off. Am iunderstanding you correctly?

    Reason i ask is i'm not sure that's how mine works.

  2. #32
    Super Star Member Diamondpilot's Avatar
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    Jan 2007
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    Daleville, IN
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    Jinma 254/284 Ford 861 Powermaster at work

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    Quote Originally Posted by sparc View Post

    Just to be clear for myself and my 2012 F-350, you are saying there is a relay that physically disconnects the power on all conductors in the trailer connection when thetruck ignition is off. Am iunderstanding you correctly?

    Reason i ask is i'm not sure that's how mine works.
    Every late model Ford, say 1997 & on, has a relay for the 12v charge circuit only. Just this one function. All others are either connected all the time or controlled by the key switch.

    The brake light works with application of the brake pedal, turn signals with its switch, reverse lights via the gear shift, running/tail lights via the light switch, ect.

    Chris

  3. #33
    Platinum Member sparc's Avatar
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    Oct 2011
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    NJ
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    JD 4410, NH TC-25, Bobcat M610, JD X534, Dig-It Model 158

    Default Re: truck battery dead after parking with trailer hooked up

    Quote Originally Posted by joshuabardwell View Post
    That was my thought. If I want accessory power, I generally only want it to be on when the key is in the on or ACC position. Any alternative is just an invitation to run down one's battery. I will say that I have seen a few cars where they have one 12-volt receptacle that is keyed and one that is always on--perhaps if you are going to have some accessory that you want to charge up even when the car is off. I thought that was an okay idea, I guess.
    I wish my ford had at least one of its four 12v sockets that switched off with the ignition, i have a dockingstation for my cell and it would be nice to be able to leave it plugged in and not have it powered up when i get out of the truck.

  4. #34
    Elite Member
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    Jul 2006
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    4,409
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    Northwest, WA

    Default Re: truck battery dead after parking with trailer hooked up

    Went and poked around a little with a test light in the 7-way plug on my 2000 Dodge.

    One terminal, approx in the 1 o'clock position is hot all the time, 24/7.

    Lid on the plug has a pin layout and just calls it " + ".
    ::Sent from a standard desktop keyboard::

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  5. #35
    Elite Member
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    May 2012
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    2,866
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    Knoxville, TN
    Tractor
    Bobcat CT225

    Default Re: truck battery dead after parking with trailer hooked up

    Quote Originally Posted by Willl View Post
    Went and poked around a little with a test light in the 7-way plug on my 2000 Dodge.
    One terminal, approx in the 1 o'clock position is hot all the time, 24/7.
    Lid on the plug has a pin layout and just calls it " + ".
    That's the 12-volt pin. You got it.

  6. #36
    Super Member
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    Apr 2000
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    7,910
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    Shingle Springs California
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    New Holland TC40D

    Default Re: truck battery dead after parking with trailer hooked up

    Our older trucks do not have the relay. My Ram2500 is '01; the +12V "charge" line to the trailer connector is hot all the time.

    Quote Originally Posted by Willl View Post
    Went and poked around a little with a test light in the 7-way plug on my 2000 Dodge.

    One terminal, approx in the 1 o'clock position is hot all the time, 24/7.

    Lid on the plug has a pin layout and just calls it " + ".
    RobertN in Shingle Springs Calif

  7. #37
    Super Member Gary Fowler's Avatar
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    Jun 2008
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    6,518
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    Bismarck Arkansas
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    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: truck battery dead after parking with trailer hooked up

    Yesterday I pulled the battery out of the box on the trailer. The box was about half full of water so I drilled some drain holes in the bottom while I was at the task. Used my multi-meter to check voltage and it was 12.39 v. I went ahead and put it on maintainer and will see what it does next time I am in my shop. By the way, the trailer had been unhooked for about 5 or 6 days and the battery was still up so, not sure why it drained the truck battery before. I will just unplug it from now on when I park it if I need to leave it hooked to the truck.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp CC AC/DC welding machine and all the tools needed to keep them all repaired and running.

  8. #38
    Super Star Member Diamondpilot's Avatar
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    Jinma 254/284 Ford 861 Powermaster at work

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    Quote Originally Posted by Gary Fowler View Post
    Yesterday I pulled the battery out of the box on the trailer. The box was about half full of water so I drilled some drain holes in the bottom while I was at the task. Used my multi-meter to check voltage and it was 12.39 v. I went ahead and put it on maintainer and will see what it does next time I am in my shop. By the way, the trailer had been unhooked for about 5 or 6 days and the battery was still up so, not sure why it drained the truck battery before. I will just unplug it from now on when I park it if I need to leave it hooked to the truck.
    Sounds like the battery is fine. I would keep a eye on the trucks battery and charging system.

    Chris

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