Just a add on. When towing switch the caravan switch to Car.This should!! charge the battery and power the fridge if fitted. Switch to caravan when mains is plugged in. Off islates all 12v areas(Your fridge(if fitted) can be powered by mains or gas normally. but not by 12v as the power consumption by a fridge is too great.
Iam sory matey but some of the information you give is incocerct.
The car/caravn changeover switch is provided on this mudule and should only be used the folling way.
when in this position dc power is available from the caravan battery to power all 12v circuits,it must also be in this postion when using mains as it will charge up battery.
When in this position with charger switch on power is provided to al dc circuits. With charger OFF all dc circuits are isolated.
NOTE:.. the switch should be in this position when van is beeing towed.
NOTE:.. First conect towing vehicle via 12s socket the switch is placed in this position ONLY if the van battery should become completly discharged. Power is supplied from car battery it will power lights and pump only.
This is only a short term use as it will discharge car battery very Quickly.
There is no off switch.
I hope this has cleared up a very big misunderstanding of how to use the ECM as many people I have met do not know how.
No offence to Rob