i have the drok pzem 031 with built in shunt. Two wires for DC + and – in. Two wires to load. Sounds easy but I can’t get it to work. I have a camper van 2 12v batteries for 12volt supply I would like to take the 12volts from the batteries to power the meter and I want to meter the current load the supplies my whole camper from those 2 batteries as well. For DC 12 volts in can I take the power directly from battery terminals + and – then also take the load directly from the same battery terminals as well. That doesn’t seem right, because then I could just run + and – from battery terminals to drok dc + and –  in to power the meter and also jumper at the meter from + dc in to + load and from drok dc – in to load -. If thats the case the I would only have two wires coming to the meter and two jumpers at the meter. Please can you show me a correct wiring diagram. Thanks for your help.