Hello! I've built a small adjustable PSU with a buck converter (XL4015 module) and a cheap 10A digital voltmeter and ammeter. It worked fine for a few minutes but after that the voltmeter started fluctuating between the real voltage and something like half of that, most of the time showing the wrong value.
I've wired it following a schematic on the internet, but powered the voltmeter from the input of the buck converter (where as in the schematic the red -meter power- and yellow -Vsense- wire where connected) because the output will go as low as 1.5V, not being able to power the meter. I've tested the meter separately and confirmed that the problem is related to it. I do have a spare one, but I don't want to do the same thing with it. Is the wiring correct? Is there any chance I could fix the meter?
(edit:) Sorry for the lack of details, it was my first post.
The shunt is connected to the thick black and red wires. And I've let the thin black disconnected because It's common with the thick one.