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Hi, I, for one, am confused as to what meter you have. I have used a 'watt meter' which has a built-in shunt. If your purchase is of this type then I recommend a site like the following for further information: https://powerwerx.com/watt-meter-analyzer-inline-dc-bare-wire If however your purchase consists of a wattmeter display and an external shunt, then I recommend looking at the schematic contained in this e-bay item: DC 6.5~100V 20-50-100A LCD Digital Combo Panel Display Volt Amp Power Watt MeterSeller : ugseller2014 (2008 ) In either case note that in order for the display to work with low [, say < 2-3 ] volts there are an addition two, small, wires which need to be attached to a separate power supply in order to provide enough voltage to power the display. Higher measured voltage will, in itself, power the display. That is why the call out for the wattmeter described above is for “6.5 to 100 V”. Hope that if you are still confused, it is on a higher plain. Cheers, David |