It was working nicely with my 4 AGM batteries. But, after I changed them out for 4 LiFePO4 batteries with BMS, it has gone dark.
I measure 13.4 volts on the red wire at the shunt PCB.
I’ve swapped out the display portion with no change in symptoms.
I suppose my next step should be to buy a new shunt PCBoard for $22 on Ebay. But, there appears to be only 3 components on that board: 1 tiny capacitor and 2 box capacitors.
If one of those went bad, could it cause the display to go dark?