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Old 02-25-2017, 07:58 PM   #1
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2017 Classic Batteries Charge from Tow Vehicle?

I have a 2017 Classic and wanted to know if the batteries are charged while plugged into the 7 pin connector and towing? I used to tow my pickup truck behind My motor home and the truck batteries were charged.
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Old 02-25-2017, 08:04 PM   #2
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It should, won't charge to full, but will maintain and improve current charge
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Old 02-26-2017, 05:44 AM   #3
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Thank you.
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Old 02-26-2017, 07:43 AM   #4
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In my experience, the answer to the OP's question is "maybe". My F-150 had a relay to control power from the TV to the TT. I understand it was originally supplied in an envelope in the glove box but was not installed by the previous owners of my truck and lost. The purpose of the relay was to ensure that there was no drain on the truck's batteries unless the engine was running. In order to get power to charge the batteries while driving I had to buy and install the relay. The best bet is to use a meter of test light to check for the presence of 12V on the connector. Looking at the connector on the truck, with the index key up, there should be 12 volts on the pin at 1-o-clock, just to the right pin number handy, but with lights off, no brakes applied

My new (to me) Ram 2500 charged the batteries when I bought it and does not turn off the voltage supply when the engine is not running. As a result, if the 7-pin is left in when parked and the TT batteries are weak, it is possible to drain the truck batteries to support the trailer. I always unplug, even is just stopped for a night en-route.

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Old 02-26-2017, 08:15 AM   #5
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To echo those comments above, maybe. My Chevy came with the factory towing package but one wire had to be connected at the fuse block and a fuse had to be installed for the charging connection. The dealer neglected to do it, so I did. GM did not install a voltage relay so the connection was always hot, even with the ignition off. I bought a relay from Atkinson connects the charging current only when it sees alternator voltage.

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Old 02-26-2017, 12:24 PM   #6
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My GMC does not charge Airstream batteries while towing.
It is wired for it but the wire has to be connected into the under hood fuse box.
I never had it hooked up. Electricity is Greek to me.
The answer to your question is maybe.
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Old 02-26-2017, 03:17 PM   #7
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If in good condition the battery charging system in your TV will put out 14.7 volts to keep your car's 12volt battery fully charged but you AS battery will not see this much voltage because of losses in the vehicle wiring.
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Old 02-26-2017, 04:53 PM   #8
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If GMC or Chevy Tow vehicle see - http://www.airforums.com/forums/f37/...-149371-2.html post #23

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Old 02-27-2017, 06:35 AM   #9
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Good morning Airstreamers..
This is not an easy question to answer. There are many conditions that are specific to each and every tow vehicle. The above answers are all correct depending on what tow vehicle you are using, and how it is set up...

Chevy trucks of the 2008 and newer have a "Tow Haul" mode on the shift lever. This mode prevents the transmission from over shifting at low speeds, but also------Engages the circuit that will charge the battery on the tailer.

Check the manual for the tow vehicle. Look for items such as: location of fuse, charging wire circuit, and connections. If that does not work, a good trailer hitch installation company is well equipped with knowledge and reference material to get accurate information.

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Old 02-27-2017, 07:23 AM   #10
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I think you are a bit misinformed. If the factory wiring is connected and fused, the charging wire on a 2012 GM truck is energized all of the time, ignition off or on. Of course if the engine is not running, it is at battery voltage. If the engine is running, it is at alternator voltage. My understand is that Tow-Haul assures that the alternator stays in high output, which will assure better charging of the trailer battery, although there still has to be some significant voltage drop with that wire size and the distance.
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Old 04-12-2017, 05:37 PM   #11
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Update. My 2014 RAM Ecodiesel does charge the batteries while connected to the trailer. I appreciate all your responses.
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