Permanent battery charger leading to Quiescent Current error code

[Iany1954]

Several days ago I fitted a permanent battery charger connection to the starter battery (directly across the terminals). I now have a CTEK MXS5.0 connected permanently while parked up at home. This keeps the starter battery fully charged and as it’s ’intelligent’ should not cause battery problems. Today I did a Carista fault check and found code 02256 (battery quiescent current). This was not there when I installed the charging cable. Could this be due to the Seargent Power B2B deciding to give the leisure battery a charge? It’s only appeared once in about 5 days so this could make sense. Not sure whether to worry or accept this as a regular occurrence when keeping their starter battery fully charged! Any ideas appreciated!

 

[Johny]

Several days ago I fitted a permanent battery charger connection to the starter battery (directly across the terminals). I now have a CTEK MXS5.0 connected permanently while parked up at home. This keeps the starter battery fully charged and as it’s ’intelligent’ should not cause battery problems. Today I did a Carista fault check and found code 02256 (battery quiescent current). This was not there when I installed the charging cable. Could this be due to the Seargent Power B2B deciding to give the leisure battery a charge? It’s only appeared once in about 5 days so this could make sense. Not sure whether to worry or accept this as a regular occurrence when keeping their starter battery fully charged! Any ideas appreciated!

Shouldn't be fitted to the negative terminal

 

[Iany1954]

Shouldn't be fitted to the negative terminal

Ok, can you explain why please? I thought that at the negative terminal the van shunt would not see any current flow and thus wouldn’t generate errors. Changing it is easy but I’m curious as why! Would this also stop 02256 errors?
Many thanks
Ian

 

[TallPaul_S]

Several days ago I fitted a permanent battery charger connection to the starter battery (directly across the terminals). I now have a CTEK MXS5.0 connected permanently while parked up at home. This keeps the starter battery fully charged and as it’s ’intelligent’ should not cause battery problems. Today I did a Carista fault check and found code 02256 (battery quiescent current). This was not there when I installed the charging cable. Could this be due to the Seargent Power B2B deciding to give the leisure battery a charge? It’s only appeared once in about 5 days so this could make sense. Not sure whether to worry or accept this as a regular occurrence when keeping their starter battery fully charged! Any ideas appreciated!

Shouldn't be fitted to the negative terminal

As above, anything connected to the SB negative needs to be connected to a chassis ground, not the SB terminal. Or at least, to the chassis side of the Shunt, which is a small black box on the negative terminal. Connecting directly to the terminal will bypass the shunt on the SB which measures the state of charge and voltage of the SB, used by various systems in the van. Charging while bypassing this will mean you're charging the battery but the van doesn't know that you're charging the battery.

There's normally this covering the negative terminal which basically says don't connect to the terminal.

 

[Scottish Scrutineer]

Ok, can you explain why please? I thought that at the negative terminal the van shunt would not see any current flow and thus wouldn’t generate errors. Changing it is easy but I’m curious as why! Would this also stop 02256 errors?
Many thanks
Ian

as @TallPaul_S says, connect the charger to a body/chassis earth, not direct to the battery terminal. There should be nothing other than the shunt box directly connected to the negative terminal. The shunt monitors charge and draw so if they don't tally up, it can trigger a fault.

 

[Johny]

Enough said!!

 

[Iany1954]

Enough said!!

Indeed so! I’ve changed it over as indicated. Many thanks for the help. I’ll check with Carista in a few days and hopefully no error 02256!
Thanks again
Ian