Strange shunt connections

[F51]

A friend asked me to look at his start battery bank which shows a constant 0.3 amp discharge on his Link 2000. This battery monitor has one shunt for both start and house banks. There are separate sense wires for the start and house banks leading up to the display. I have never seen two sensors wired to the same shunt before. As a kicker, there is an additional sense wire which is attached to the center of the shunt! I don't know what that's for. Can someone who has experience with this device explain it to me? Thanks.

[smac999]

all the 2000s are like that. the center is probably the ground for the meter. they also have 3-4 power leads.


0.3 amp I'd probably just call that an error unless you confirm the draw with another amp meter (inline, not clamp). they are getting old. I have seem them read that even with the shunt wires disconnected and shorted to each other.


unless you confirm there is draw with another meter I would just ignor it. you might have to manualy reset it every so often to not get a low battery alarm which will happen over time as the start AH drains on meter.