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Old 11-12-2018, 10:31 AM   #1
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Charging trailer's battery while driving?

Will the truck's electrical system charge our 2005 24ft Zinger batteries while driving? Our trailer has the standard round plug-in to the truck
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Old 11-12-2018, 10:37 AM   #2
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6 wire or 7 wire plug? If it's hooked up correctly it will.
If you have the 7 wire plug, here is a diagram of how it should be hooked up to work properly.
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Old 11-12-2018, 02:23 PM   #3
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Also check your owners manual for the location of the trailer 12v + fuse in your tow vehicle. Had a truck once with the factory tow wiring but the connector wire for the brake controller and the fuse for the battery charge was in the glove box and the owner had to install it.

If you have a test light you can check the plug on your truck per the diagram that Lloyd posted. Check with the key on and the key off. Had a truck that only had power with the key on but my current GMC has power all the time. Just connect the clamp to a good ground-bumper or frame- and then touch the test light to the correct location.
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Old 11-13-2018, 02:58 PM   #4
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Yes it will charge the batteries. But, mostly by definition.
Unfortunately the reality of electrical transfer of 12 volt is very difficult.

The losses from the front of the tow vehicle to the battery on the towed vehicle is pretty big.

The answer is a bigger wire. However, manufacturers do not do that for the most part.

So the answer is yes, however do not expect much.
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Old 11-18-2018, 04:16 PM   #5
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Like the previous posts have said, it will work, but for it to work well you need a heavier wire.
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Old 11-18-2018, 04:47 PM   #6
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If your Ford has the charging relay and fuse, prior to 2013 these came in a bag and not always got installed if you bought the truck new it should have a bag with a few parts these need to be installed. Somewhere around 2013 Ford started installing these from the factory, ask me I know, had a 2009 and did not have these installed, have a 2013 but due to another charging issue I thought ( so did 1 fellow at the dealer ship and the internet) that these were required, later another dealership guy said no cause any vehicle after 2013 had them installed. I had other charging issues with the truck. You can check and see if at the 7 prong connector there is 12 volts on the pin that is supposed to provide the charging power. (I found that pin from internet search and I did not have 12 volts there. My truck required a dealership investigation.

Hows that for a short answer!

Good luck
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Old 11-19-2018, 06:29 AM   #7
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Charging RV battery from tow vehicle

Originally Posted by Zeil View Post
Will the truck's electrical system charge our 2005 24ft Zinger batteries while driving? Our trailer has the standard round plug-in to the truck
It should charge the battery while you are towing. Most auto alternators put out 13 plus volts which will charge a 12v battery. There are two caveats, however. The alternator must be able to deliver enough curren to run the tow vehicle electrical load (headlights, vent fan, etc), and any load the trailer is drawing as well (interior and exterior lights, fridge, fans), and have excess capacity with which to charge the battery. Make sure you have minimal drain from the trailer devices.

If you have a vehicle with a towing package from the manufacturer you should have a larger than standard alternator.
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Old 11-19-2018, 09:38 AM   #8
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Yes, if you have a volt meter or vom, you can check the static voltage of your trailer battery and expect to find between 12.8-12.4 volts if good. While the truck is plugged into the trailer and running, you should expect to see between 14.2-13.4 volts.
The good news is the system will not allow the trailer to draw off your trucks starting battery once low and threaten to not start your truck. It's a one way diode type hook up.

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Old 11-20-2018, 04:58 PM   #9
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An easy way, once you're hooked up to the vehicle, and not plugged into shore power. Assuming you have the same 4-LED monitor panel, you will probably get 3 lights when the TV is not running, (indicating standing battery power) and 4 lights when your TV is running and charging. Mine works that way.
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