Are You Making It All To Complicated?
Hello Ken,
I am not sure I understand what you are trying to do but in my opinion you are making it all too complicated.
Here is what I would do in your situation, if I understand it correctly. If you have a spare battery in the TV, I would get some heavy duty welding cable(2ga is $1.50/ft - smaller is cheaper. Welding cable is so flexable it is like a wet noodle and easy to work with. Connect this cable(+ $ -) from your TV starter battery to your spare battery then on to a new two pole male plug (pollak from etrailer.com) on the back of your TV. Connect new welding cable directly to your TM batteries from the female end of the new polack plug placed on the TM. Leave the existing TM plug as is!
That's it as far as I can see. Your TV will charge your spare battery and your TM batteries while towing - or when you are at a site. Just make the wire size as large as you can afford.
I hope it helps you on your project. Just let me know if there is something I don't understand about your setup.
Take care,
Phil
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