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    Senior Member Rodbuster's Avatar
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    Is this OK...or is it bad?

    Goob morning,

    My wife and I are planning a 2 week trip up to New Hampshire in about 5 weeks with our new Key Largo.
    We are leaving from central Florida so we plan on spending the first travel night in N. Carolina and the second in Pa. On the first day, we plan on getting to N.C. about 4 or 5PM and leaving in the morning about 6AM.

    What I would like to do is leave the unit hooked up to my truck and just hook up my electrical and water. Is that OK to do? We realize that there will be a little bouncing and don't see a problem.

    Thank you
    Rodbuster

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    Re: Is this OK...or is it bad?

    Have done it plenty of times, no problems. I do disconnect the electrical from the truck, don't know if it is an issue, but figured at least that way nothing could feed back into the trucks system. Just hang the electrical cord over the side of the truck bed as a reminder in the morning to reconnect prior to taking off.
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    Oklahoma Chapter Leaders-Retired Hastey's Avatar
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    Re: Is this OK...or is it bad?

    You shouldn't be able to back feed the A/C to your trucks D/C system. The battery maintenance system would hold that off. If it done anything it would just keep trickle charge to your TVs battery(s)
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    Senior Member Rickhansen's Avatar
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    Re: Is this OK...or is it bad?

    Quote Originally Posted by Hastey View Post
    You shouldn't be able to back feed the A/C to your trucks D/C system. The battery maintenance system would hold that off. If it done anything it would just keep trickle charge to your TVs battery(s)
    I beg to differ. Most tow vehicles have a 12VDC line intended to charge your RV batteries while you are driving. so, your truck's DC battery and charging system is tied directly to the RV's 12VDC system, with the RV Battery(s) and the DC side of the RV 110VAC/12VDC converter, as well. When your truck is turned off, and the RV is on shore power, the convertor is charging your truck battery in parallel to the RV battery. This exactly is a backfeed.

    Rodbuster - I can second RVacation Campground. I lived there for two and a half years. http://www.rvacation.us/ - say hi to Tony and Camper for us.
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    Founding VA Chap Ldr (Ret) boatto5er's Avatar
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    Re: Is this OK...or is it bad?

    Quote Originally Posted by Rickhansen View Post
    I beg to differ. Most tow vehicles have a 12VDC line intended to charge your RV batteries while you are driving. so, your truck's DC battery and charging system is tied directly to the RV's 12VDC system, with the RV Battery(s) and the DC side of the RV 110VAC/12VDC converter, as well. When your truck is turned off, and the RV is on shore power, the convertor is charging your truck battery in parallel to the RV battery. This exactly is a backfeed.

    Rodbuster - I can second RVacation Campground. I lived there for two and a half years. http://www.rvacation.us/ - say hi to Tony and Camper for us.
    Wow! Forgot all about Camper. He's a part of the culture there!

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    Oklahoma Chapter Leaders-Retired Hastey's Avatar
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    Re: Is this OK...or is it bad?

    Quote Originally Posted by Rickhansen View Post
    I beg to differ. Most tow vehicles have a 12VDC line intended to charge your RV batteries while you are driving. so, your truck's DC battery and charging system is tied directly to the RV's 12VDC system, with the RV Battery(s) and the DC side of the RV 110VAC/12VDC converter, as well. When your truck is turned off, and the RV is on shore power, the convertor is charging your truck battery in parallel to the RV battery. This exactly is a backfeed.

    Rodbuster - I can second RVacation Campground. I lived there for two and a half years. http://www.rvacation.us/ - say hi to Tony and Camper for us.
    That's just what I said, the A/C current from your shore hook-ups cannot get to your tow vehicle. The 12VDC "battery tender" will not let any A/C current to your TV. Even if you are not connected there is 12VDC to that feed from your truck. In fact this is the same feed that I tapped into that runs my transfer pump for fueling my equipment around the farm from my aux tank and it is live all the time.

    Now just so you know I'm not just talking out my rear, and btw I am in now way trying to be a smart-a## either so please don't take it that way. Take your multi-meter or testlight out and check your 7-pin without anything hooked up or on. With the truck off you will have 12VDC there at the Aux Pin. With your trailer hooked to 30/50 amp check your trailer connection and you will have 12VDC there to. So backfeed or not you are only adding 12VDC to a 12VDC system. JMHO
    Oklahoma Chapter Leaders-Retired
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    Wife Stacy, 11 yrs Army, now RD/LD
    Our Furry Kids Arnie and QP (cue-pee)
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  7. Print this Post   #7
    Senior Member Rickhansen's Avatar
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    Re: Is this OK...or is it bad?

    Quote Originally Posted by Hastey View Post
    That's just what I said, the A/C current from your shore hook-ups cannot get to your tow vehicle. The 12VDC "battery tender" will not let any A/C current to your TV. Even if you are not connected there is 12VDC to that feed from your truck. In fact this is the same feed that I tapped into that runs my transfer pump for fueling my equipment around the farm from my aux tank and it is live all the time.

    Now just so you know I'm not just talking out my rear, and btw I am in now way trying to be a smart-a## either so please don't take it that way. Take your multi-meter or testlight out and check your 7-pin without anything hooked up or on. With the truck off you will have 12VDC there at the Aux Pin. With your trailer hooked to 30/50 amp check your trailer connection and you will have 12VDC there to. So backfeed or not you are only adding 12VDC to a 12VDC system. JMHO
    Hastey,
    I don't mean to derail Rodbusters question. I'll agree with you that with everything working normally, that if you have 12.0 volts both from the truck and the RV, you have no current flowing either direction through the pigtail connector. That's simple ohms law.

    If you are plugged in to shore power that is not the case however. The convertors in most of our RV's are capable of delivering 60+ amps. The voltage is also determined based on which mode the convertor is in. For instance, the Progressive Dynamics 9200 Series provides 4 modes of operation; BOOST, NORMAL, STORAGE and DESULFATION modes which can deliver just under 16 volts. Probably not recommended by your vehicle manufacturer, but still none of that should be any problem.

    I've also been victim of a nearby lightning hit that ran in to our RV via the shore power (at RVacation in 2007, in fact) connection, that caught a surge suppression power strip on fire 3 hours later and a television to die 2 days later. I realize that is on the 110v side of the convertor, but I'm glad my $65k truck wasn't plugged into anything at the time.

    My advice stands, and anyone is welcome to take it or leave it. Disconnect the pigtail, as it serves no practical purpose when you are on shore power, it takes 30 seconds.
    Rick and Jan Hansen

    2009 Bighorn 3670RL, #1735
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    Re: Is this OK...or is it bad?

    Quote Originally Posted by scotty View Post
    Have done it plenty of times, no problems. I do disconnect the electrical from the truck, don't know if it is an issue, but figured at least that way nothing could feed back into the trucks system. Just hang the electrical cord over the side of the truck bed as a reminder in the morning to reconnect prior to taking off.
    We do the same.... also put down the rear stabilizers.

    CS

  9. Print this Post   #9

    Re: Is this OK...or is it bad?

    Overnight stay in a parking lot or campground, all I do is drop the front gear to help steady the trailer. I don't bother unhooking the pig tail.
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  10. Print this Post   #10
    Senior Member Rodbuster's Avatar
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    Re: Is this OK...or is it bad?

    Thank you Scotty.
    Good idea to disconnect the electrical from the truck.

    Rodbuster

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