Originally Posted by 5456Mich
Anyone install a switch to keep the battery from drawing down while towing ? I need to look into that.
Nice job on the base plate. When I installed mine, I was concerned that I would boil my car battery dry if I hooked it directly to the motorhome chassis battery. After all, every time you start the MH engine, it will get high voltage until it recharges.
On the other hand, I've got daytime running lights on my toad and they drain a lot of power, but it is continuously and not just when the MH starts up.
In my experiments, I managed to kill my toad battery (but it was 10 years old, anyway). So, I now have an AGM battery in my toad, and it will handle a little more nonsense and allow a bit of deep cycling.
I have installed an RVibrake Towed Battery Charger that cost $50 from HitchSource. Other organizations seem to have competitive products. (I also am using a 6 pin to 7 pin adaptor to get the power).
I opened the case on my RVIbrake and cut away some excess silicone glue. It seems to have a little MOSFET power regulator from the STF18N65M5 family. Looking at the docs for that chip, I'm not sure whether it is limiting voltage or limiting current. I think that a plain vanilla MOSFET limits voltage.
At any rate, the RVI brake seems to work OK. It doesn't let my battery run down, even though the daytime running lights are probably drawing about 50 watts or so.