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Battery Charge Cable


Due to the amount of Dry Camping we do, it is sometimes necessary to charge the camper battery "on site".  In the past this has been done by pulling the tow vehicle up to the front bunk, opening the hood, attaching jumper cables and connecting them to the pop-up battery.  A lot of trouble!  With this cable, we can just plug into the trailer connector on the tow vehicle and charge the battery.


All photos are thumbnails, click to see an enlarged version

Here you see the parts necessary:

1-Bargman style 7 pin round connector

2 Battery clips, color coded Red + & Black -

10 feet split loom tube

10 feet each, #10 stranded wire Black & White

To the left is a close up of the Bargman style 7 pin round connector.  The one I purchased has screw terminals to connect the wires.  For a cvhart of the connections, check out Lee's Electrical Page
Connection to the battery is through color coded battery clips.
The connection to the tow vehicle is the same as hooking up your trailer, just plug in the 7 pin connector.  On my Ford F-150 power is applied to the #4 (black) terminal on Bargman style 7 pin round connector ONLY when the vehicle is running.

Battery Charging Considerations

To charge a battery, the voltage from the charging source must be above the voltage of the battery.  If you have gauges in your vehicle, take a look at the voltage gauge the next time you are driving.  Even though the vehicle has a 12v DC electrical system, the gauge should read 13+ volts.  charging   To charge you need a voltage above the battery voltage to charge it. If you battery is at 11 and you alternator is putting out 14 it is fine. A fully charged battery at rest (i.e. after sitting for a couple of hours with no load or no charging) will be around 13.8 volts.

Safety Considerations

Connect the clips to the battery before plugging in the connector

Due to the current necessary for vehicle starting, never use this type of a device to "jump start" another vehicle

Wear safety glasses anytime you are working around a battery

As most Pop Up manufacturers place both the LP Gas tank and the 12v battery in proximity to each other on the trailer tongue care should be used in any situation in which the battery may "spark".  This could include  using this battery charge cable.  If there is any chance of LP Gas vapor (did you just change the tank and some gas vented?) being present DO NOT do anything that may cause a spark until the gas has had time to dissipate.

   Revised: May 08, 2007

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