ADC3 reading about 1/2 volts

[sailingharry]

I use ADC3 to monitor voltage on my engine start battery.  I swear it used to work.  I noticed that it is only reading about 6.3, or about 45% of actual volts.  I reset the SBMS0 a few times (remove fuse on the ADC line, pull ribbon, reinsert, allow to boot, reinsert fuse).  If the fuse is out, it reads 0.0V, so the calibration is correct.  But, with the fuse in, it consistently reads 6.3 (same voltage every time).

I move the wire to ADC2, it works perfectly.

Did I fry something?  Is there an explanation?  I liked the position on the screen for the voltage (last item), but ADC2 is just fine.

[Dacian Todea (electrodacus)]

Tho be sure that it calibrated correctly you can look in the Diagnostic menu where ADC2 and ADC3 calibration values are displayed. A photo of that will help me see what the problem may be.

Both ADC2 and ADC3 can read up to 60V so not sure how they could be damaged and between the ADC input and the signal there is a resistor divider so if you add a resistor in line with ADC3 then that could explain reading less than half and the resistor value should be a bit over 300kOhms thus maybe oxidized connection.