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Old 08-04-2011, 09:15 AM   #1
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charging towed vehicle

Hi All: I have a 7 pin socket that connects to my 2005 malibu and operates the tail lights. How do I connect a wire to charge the vehicle battery so I don't have to pull any fuse.

Thanks russ
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Old 08-04-2011, 10:09 AM   #2
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Beginners Guide to RV Wiring
Wiring the 7 pole RV Tow Vehicle Socket
View looking into the front (contact) end of tow vehicle socket. There are two wiring codes for different 7 pole plug sets.
Most RV's use the RV wiring code for the type of plug/socket
that has 6 flat contacts surrounding the center round pin.
Semi's and other commercial trailers use the ASME
(American Society of Mechanical Engineers) type of 7-pole plug set.
This plug has 6 round contacts surrounding the center pin.
The wiring color code for this plug is not the same as the
RV 7 pole plug described below, and will be included at a future time.
7 pole RV plug/socket.TerminalWire ColorFunctionLocation - Truck socketLocation Trailer plug1WhiteGround7:00 o'clock5:00 o'clock2BlueBrakes5:00 o'clock7:00 o'clock3GreenRunning10:00 o'clock2:00 o'clock4BlackPower2:00 o'clock10:00 o'clock5RedLT & Stop9:00 o'clock3:00 o'clock6BrownRT & Stop3:00 o'clock9:00 o'clock7YellowAux or BUCenterCenter
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Old 08-04-2011, 10:32 AM   #3
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I assume that you want to use the power lead from the MH to charge/maintain the battery on the toad.

If so, you would connect the power line (Black in above diagram) to the positive terminal of your toad's battery. I highly recommend a fuse, a current limiter, and a diode be used to protect the circuit.

Diode is installed to prevent reverse flow from the toad to the MH. Current limiter keeps from blowing the fuse if you try to draw too much current - for example, trying to start the toad engine while connected to the MH.

I use a simple current limiter made of 2 60 watt headlight bulbs in parallel. It limits the current to about 10 amps.
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Old 08-04-2011, 11:50 PM   #4
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On my 09 Saturn I have to pull a 2amp fuse, I decided once not to pull it on the way home and see what would happen. Everything was fine till it got dark and the automatic headlights decided that it was dark. Pulled into a rest area and pulled the fuse and the lights went off. Now I pull the fuse.
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Old 08-05-2011, 06:32 AM   #5
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Pulling the fuse on our GM product is required so that the speedometer (mileage) is disconnected. We installed a switch in that circuit - no more fuse removal...
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