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Battery Charging

Discussion in 'Towing' started by tmreyes1, Mar 11, 2013.

  1. Mar 11, 2013 at 8:38 PM
    #1
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    I am wanting to add power to my M416 type trailer and want to know if I wire up a charger/maintainer to the trailer battery and convert the trailer 4 way to the 7 pin to match my truck will it run the charger while I am driving? I also plan on using a 800 watt inverter when camping. I will mainly use it for lights and a tent fan for the summer
     
  2. Mar 11, 2013 at 10:46 PM
    #2
    S.B.

    S.B. Well-Known Member

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    I did the same for the battery for my break-away system. I believe I hooked it up to the aux.
     
  3. Mar 12, 2013 at 3:55 AM
    #3
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    OK. One of the wires in the 7 pin is labeled + power. I am guessing that is power from the charging system and is only hot with the key on.
     
  4. Mar 12, 2013 at 6:02 PM
    #4
    03stepsidetaco

    03stepsidetaco Member

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    it might be, could be hot all the time or not at all if theres no fuse inplace.
    just grab a test light and try it with the ing. on and off.
     
  5. Mar 12, 2013 at 6:25 PM
    #5
    S.B.

    S.B. Well-Known Member

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    That sounds right
     
  6. Mar 17, 2013 at 7:16 AM
    #6
    Shadetree

    Shadetree Well-Known Member

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    A couple of tips:

    1. There is going to be a voltage drop in your wiring, so the deep cycle battery in the trailer/camper will not receive a full charge. You should "top off" your trailer battery charge with an external charger whenever it is practical and again before you store your trailer. [This will prevent an accumulation of lead sulfate and a premature loss of battery capacity.]

    2. If the trailer battery is wired in parallel to your starting battery, isolate it by disconnect it from the towing vehicle when you are ready to use the trailer battery. [This is to keep starting battery from discharging, so you can restart your engine.]

    3. For safety, fuse the wiring at the source and wire for more than the maximum output of the charging system and two percent (or less) voltage drop.
     
  7. Mar 17, 2013 at 8:20 AM
    #7
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    Thanks for the tips. Bought my battery yesterday and a new 7 pin connector. I need to cut the 4 pin and add wire for power and put all that into the 7 pin connector
     
  8. Mar 17, 2013 at 12:16 PM
    #8
    campthewestcoast

    campthewestcoast Oceanfisherman

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    Power extend/retract towing mirrors,brake controller,30amp charging system for TT,snug top camper
    The factory tow package had a 18ga. charge line. Because I have to run my rv trailer refrigerator on 12volts when I tow, I was running down my house battery on the trailer. The refrigerator on 12volts needed 13amps to operate, plus I wanted charge my trailer batteries as I tow.
    I installed a 30amp circuit breaker off of my altenator,ran 8ga. wire back to the 7-pin connector, but the factory 7-pin was not set up for larger charge line wire , so I installed an aftermarket one and an aftermarket 7-pin pigtail for the trailer with heavier gauge wire. No voltage drop, runs refrigerator and charges two 12volt batteries on trailer! Next is to install 2 6volt golf cart batteries wired in series to get 12volts to double my AmpHours when I camp off-grid (boondock).
     
  9. Mar 17, 2013 at 2:56 PM
    #9
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    For now my fridge will stay in my truck and run of the truck battery. I want a battery set up for the trailer that will run some lights and a fan or blanket depending on the weather. I do no need anything to heavy duty right now. Plan on a battery and inverter for now
     
  10. Mar 19, 2013 at 12:05 AM
    #10
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    Did you run that wire straight from the alternator to the rear 7-pin connector?
     
  11. Mar 19, 2013 at 5:01 PM
    #11
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    So I checked the voltage at the 7 pin today with the truck running and it read 13.8. I checked at the battery and the main fuse block. All the same readings. I thought it should be around 14.1 or am I wrong. If the voltage does not drop from the alternator to the connector is there really a need to run a dedicated wire? I have the factory tow package with 7 pin connector. My truck is a 2012 TRD OR 4x4
     
  12. Mar 19, 2013 at 5:03 PM
    #12
    S.B.

    S.B. Well-Known Member

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    Depending on wire size (from front to the 7-pin) and current draw there will be a voltage drop. Keep in mind that it will only happen when enough load is applied.
     
  13. Mar 19, 2013 at 5:53 PM
    #13
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    Factory wire harness is 18 gauge I think. At the time I checked the voltage there was no draw. The engine was at idle. I can recheck it with a draw and see if the alternator puts out more.
     
  14. Mar 19, 2013 at 5:55 PM
    #14
    S.B.

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    You will only see a drop in voltage when enough load is applied.
     
  15. Mar 19, 2013 at 5:58 PM
    #15
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    Is that 13.8 enough to charge the battery in my small trailer? I will run 10 gauge wire from the 7 pin to the trailer battery
     
  16. Mar 19, 2013 at 6:22 PM
    #16
    S.B.

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    It will be the same voltage and amperage as what is charging your main truck battery.
     
  17. Mar 19, 2013 at 6:43 PM
    #17
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    Thanks.
     
  18. Mar 20, 2013 at 8:32 PM
    #18
    campthewestcoast

    campthewestcoast Oceanfisherman

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    The factory 18ga wire should be good enough to charge the battery on the trailer. Because I tow with a refrigerator running on 12 volts pulling 13 amps the 18ga wire was not enough for the ampage I needed. I ran a seprate 8ga. wire from my altenator to a new 7-pin connector.
     
  19. Mar 20, 2013 at 9:40 PM
    #19
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    Yeah, no heavy duty charging needed for my set up. This is the first time I am doing anything like this so all the help is appreciated.
     
  20. Mar 24, 2013 at 6:26 PM
    #20
    tmreyes1

    tmreyes1 [OP] TJ'sTOYCOMA

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    So I got my battery installed and changed the 4 flat plug to a seven pin plug. I ran a wire from the 7 pin aux power to the battery to charge while driving. My question is while it is charging does the negative terminal need to be grounded to the trailer?
     
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