Stop in for a cup of coffee

Bills65Dart said

He say he is not sure he will remember to turn the switch off always... I can see his problem, when the day is over and he is going to drive home, it is no power to start the engine. And, during wintertime northern part of Norway does not have a lot of light, so he can not use a solar panel.

Bill

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My cousin say he has seen a cut off relay that cuts out when the voltage drops under 13 volts. Like to use between a car and the camper caravan. You start the engine, the voltage goes up past 13 volts, and the power to the 12 volt battery in the camper caravan is charged, then you stop the engine, and the voltage at some point drops under 13 volts, and you use power of the camper caravan battery but nothing from the truck battery since it has disconnected. Has anyone heard about such a thing ? I find someone mentioning that Bosch are supposed to have it, but can not find the actual relay.

Bill