Brassica
Snow belt
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Joined: 01/19/2011
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This is a great idea.
I heard that some pickup trucks have an extra battery platform under the hood. The owner could buy an extra battery and use it to power the trailer. However, I don't know what the circuits are. All I know is that the connector supplies +12V and return to the trailer through the towing connector. Does anybody understand how to use that extra battery? Would the owner have to be opening switches on the extra battery to prevent a drain on the "real" truck battery?
MudChucker wrote:...if it were me, I'd fab in an isolator on the trucks trailer harness... Would that be a device to protect the regular battery or to protect the truck's entire electrical system?
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knesdad
Wisconsin
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Joined: 03/03/2004
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I have a GMC 2500HD 6.0L. It has 2 batteries under the hood. Can you explain further the isolator idea?
Thanks.
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knesdad
Wisconsin
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mkirsch wrote:knesdad wrote:donn0128 wrote:Don't forget though you need two wires to complete the circuit.
Please expand upon... Thanks.
He didn't read your OP. You listed two wire connections.
That's what I thought... Thanks for confirming. 
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BFL13
Victoria, BC
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If you have the connection for a slide-in camper behind the cab as well as the bumper 7-pin , you have a choice for where to get the power. The camper connection would allow shorter wires to the battery you might keep in a locked tool box, eg.
In either case, you can get the appropriate piece that goes on or into the truck's connection and put your two wires on the pins of that, and then put clamps (red and black set) on the other ends of those wires and now you have an "adapter" you can use anytime that will stay in place.
You won't get that many amps, but you could use #8 wires and 50amp rated clamps so they are a decent size for putting on the battery posts.
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smkettner
Southern California
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No isolator needed. Nothing to gain, could have voltage loss that slows charging.
No need to complicate things.
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mkirsch
Rochester, NY
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Joined: 04/09/2004
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knesdad wrote:donn0128 wrote:Don't forget though you need two wires to complete the circuit.
Please expand upon... Thanks.
He didn't read your OP. You listed two wire connections.
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dodge guy
Bartlett IL
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Remeber also not to run to many amps through the 7-way. It is small gauge wire (I think 12 ga.) maybe 10, but I don`t think so. either way keep the charge amps at around 20. the charge wire in the 7-way is really only intended to maintain the charge in the trailer battery.
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