Quote Originally Posted by Hendrik du Toit View Post
It is critical that you isolate the aux batt - to force any current to go through the shunt as any device, eg fridge, can get its earth through the body, bypassing the shunt and therefore it will not give a reading. As I said, easy test will be to disconnect the fridge - and solar -, ensure you have the main batt - to 250 - cable connected, and Im sure you will see results.
The shunt has to be on the aux battery neg terminal, itís the only way the BMV 602 will work.

I have made a new correct wiring diagram that I will post tomorrow when I get access to a scanner.