I just installed a BMV 712 on my boat.
I'm reading the service batteries correctly, but the starter battery gives me a very low reading of 10.51 v.
If I do the measurement with a multimeter, I get a correct reading of +/- 13.6 v.
The starter battery always gives me a reading of about 2.5 v less than what the multimeter indicates and is at 100% charge.
I have read some similar issues with a fuse problems
Could that be the problem with the discrepancy?