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Old 03-18-2015, 11:55 AM   #11
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Thanks for that fact, and to others responses and references.

With regard to wiring to the TV to allow recharge, how do I isolate it from the house circuit so as to avoid parasitic drain? If power from the 7-pin connector connects to both the house batteries and to the brake battery, does that not connect the brake battery to the house battery? Or does some circuitry in the charger prevent outflow back through the charging power source?
Absolute cheapest way - install a simple toggle switch disconnect for isolation. Use the "on" position when you are hitched and charging, and flip it to "off" when you unhitch. OK, that's not THE cheapest - you can pull the terminal off the cell - but it is one of the cheapest and cleanest!
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Old 03-18-2015, 12:36 PM   #12
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Absolute cheapest way - install a simple toggle switch disconnect for isolation. Use the "on" position when you are hitched and charging, and flip it to "off" when you unhitch.
I'm likely to forget. If there's a reasonably cheap way to accomplish it that doesn't involve my memory, that would work better.
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Old 03-18-2015, 12:59 PM   #13
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I'm likely to forget. If there's a reasonably cheap way to accomplish it that doesn't involve my memory, that would work better.
How electrically savvy are you? It can be accomplished with isolation by relay, solenoid, or diode simply enough. Basically, these would be switches triggered automatically with a current sensing setup.
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Old 03-18-2015, 01:28 PM   #14
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I correctly wired a major renovation on my house. I have the tools and skills but not the knowledge. Given a parts list and diagram, I could do it.
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Old 03-18-2015, 06:09 PM   #15
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Ok, then tell me if you tow vehicle provides +12VDC all the time or only with ignition on.
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Old 03-18-2015, 07:43 PM   #16
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Ok, then tell me if you tow vehicle provides +12VDC all the time or only with ignition on.
Dunno. Will measure tomorrow.
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Old 03-19-2015, 01:07 PM   #17
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Had a thought that might make this non-workable. I have a power jack. Am I correct in thinking the 5 watt battery can't handle the ups and downs?
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Old 03-19-2015, 03:52 PM   #18
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Had a thought that might make this non-workable. I have a power jack. Am I correct in thinking the 5 watt battery can't handle the ups and downs?
As long as you park coupler high and drop on the ball, it's enough. If you were really looking to replace your house battery, it won't. However, you can always just back close enough to attach the trailer umbilical and use TV feed to adjust the jack and then couple/uncouple.
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Old 03-19-2015, 07:21 PM   #19
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However, you can always just back close enough to attach the trailer umbilical and use TV feed to adjust the jack and then couple/uncouple.
Double checking that your plugs power pin is wired and hot, keep your TV running, and it should be fine. I'm sure you're jack also has a manual socket as well.
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Old 03-19-2015, 09:23 PM   #20
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As long as you park coupler high and drop on the ball, it's enough. If you were really looking to replace your house battery, it won't. However, you can always just back close enough to attach the trailer umbilical and use TV feed to adjust the jack and then couple/uncouple.
I'm not looking for the 5W to serve as house battery. I'll drop the 12V group 24 in place when I bring the trailer to my house to prep for a trip.

Your suggestions make my plan workable.

Thanks
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