Quote:
Originally Posted by Rob Culver
I'm toying with the idea of putting in a DC to DC charger like the non isolated Orion one that Rick suggested. But is there any possible way to put this charger on the TM side using the existing 12 volt input from the 7 pin connector as the input in to the charger? That seems tricky due to the need to supply 12 volts to the break away line. Has anyone succeeded in putting their DC to DC charger on the TM side rather than the tow vehicle?
Thanks in advance..
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That charger should be installed in the TM, and preferably close to the TM batteries (electrically speaking). The Trailer battery charge wire has a 3-way junction following the break-out of individual wires from the large bargman cable end (behind the fridge). One end leads to the 12v fuse board. In original wiring, the battery cable is also connected on that board. The other end leads to the break-away switch, allowing emergency brakes to be powered by either of those 12v sources (the TM batteries OR the bargman 12v "TBC").
But that wiring allows backflow when TBC side is lower voltage than the boosted DC->DC output voltage. To solve that new issue, You should add a 5-way relay, favoring TM battery power when battery power is present, and switching to connect the bargman TBC directly if/when battery power fails. output common goes through the break-away switch.
