Hello people My VW Passat has a 13pin socket with working duration plus and charging plus Does my caravan require a disconnection relay that separates the caravan battery from the charging current as soon as the engine is off? So that electricity doesn’t come back from the trailer to the VW? According to VW, the control unit should disconnect the connection as soon as the engine is off, however, the mechanics don’t agree if it really happens that way. plans that actually this should work without separation relays without any problems. Does it ever know,and with it? Thanks in advance