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Old 10-22-2014, 03:07 PM   #1
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Battery charging

Have Rockwood 2109S, does the battery get charged from the tow vehicle when traveling, also when we stop overnight and do not unhook trailer should we unplug trailer wire connection to eliminate draining tow vehicle battery?
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Old 10-22-2014, 03:25 PM   #2
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Please post what vehicle you have and year......
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Old 10-22-2014, 03:26 PM   #3
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Depending on your tv and if it's been enabled.

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Old 10-22-2014, 03:32 PM   #4
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On my Tundra and the F150 I had prior, 12 vdc is available at the 7 pin plug only when the vehicle is running. On both it is switched through a relay, so in that case, no it would not drain the vehicle battery if left plugged in.
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Old 10-22-2014, 03:35 PM   #5
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My truck a F350 charges my battery when in tow. When truck is off no.
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Old 10-22-2014, 03:40 PM   #6
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Quote:
Originally Posted by chaslorr View Post
Have Rockwood 2109S, does the battery get charged from the tow vehicle when traveling, also when we stop overnight and do not unhook trailer should we unplug trailer wire connection to eliminate draining tow vehicle battery?

'Depends' on your tow set up. What does your vehicle manual say? To check, take a volt meter to your 7-pin connection. Check from the 'hot' (charge) wire to a ground with the truck OFF. Is there voltage (12.5v)? If you Do Not....Good. If you do, then you have a continues hot wire and can run down your batt if left hooked up over night. Now, if there is no voltage, start the truck and see if there is voltage...? If 'yes', then you are charging your units battery... If no, then you need to find out why no voltage???? No fuse? Wire not attached? so on, so on.
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Old 10-22-2014, 05:28 PM   #7
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Have a 2010 GMC Sierra Ext Cab for tow vehicle
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Old 10-22-2014, 06:17 PM   #8
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GM is kind of iffy about things like that. They'll do something one way one year then switch the next year then back again the year after so it's hard to say. Most models, the battery run down protection will kill everything after so long at any rate (or should, anyway).

I've got the same model, different floor plan of your trailer and I can say that it WILL NOT charge if the disconnect is thrown, so if it's a concern, you don't need to unplug, just disconnect with the switch. UNLESS you need the 12V for something like the refrigerator control...then leave the battery switch alone and unplug from the truck.
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Old 10-22-2014, 06:32 PM   #9
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Battery charging

Thanks all, I think I will take Brother Les's advice and get a test light to check the plug as he said. It was good solid advice.
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Old 10-22-2014, 08:51 PM   #10
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This may help

http://www.countrytrailer.com/uploads/7wayplug.pdf


This diagram will probably help but you should see voltage on the one that has the black wire to it (right alongside the tab in the plug) On my F-150 I had to install a relay and fuse under the hood but don't know if your truck will need that.
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