Camper_Jeff_&_Kelli wrote:
Bedlam wrote:
I believe Ford is still the only one with switched power at the trailer plug.
I was just thinking, there could be a condition where you're sitting in the Truck, key on, engine off, and the DC DC charger is pumping 30 amps from the truck battery back to the TC batteries. That could be a recipe for a dead battery . . .
To prevent this from happening you can use a battery isolator (BI) which can be installed in the truck or the truck camper, or anywhere in between. Lot easier to install vs. running a trigger wire from the alternator/engine all the way to the dc to dc charger. Takes very little wire/cable to connect a BI.
The BI won't allow power to the dc to dc charger unless it senses voltage higher than 13.3v. This indicates to the BI that the alternator is active. The BI simply closes a relay that allows power to flow to the dc to dc charger. When voltage drops below 12.8v (alternator not active), it opens a relay and cuts-off power to the dc to dc charger.
You can wire the BI to cut-off primary power to the dc to dc charger input, or you use the BI to cut power on/off to the dc to dc charger's ignition trigger wire. Either way, it works in the background, seamlessly, automatically.
