BMS 12/100 CL parallel between ALT and LI ION oles

Dear Victron Friends,

I’m facing the following issue on one of my last installations:

BMS 12/100 CL ALTERNATOR STARTER BATTERY POSITIVE STUB shows a voltage of 13,36V even if starter battery and alternator are disconnected from the pole.

House batteries (3 x LFP-SMART 12/200) voltage is 14,2V during absorpion and 13,5V on float.

It seems that there is a parallel between ALT pole and LI-ION+ one (even if with a low voltage drop)

If I disconnect House battery and I connect Starter the BMS switch on

Is that normal? If yes, Why?

Thanks a lot

See this thread on one of the other alternator BMS units which reported the same thing and turned out to be leakage current. Try the lamp test outlined in this post to see if it is just leakage current.

https://community.victronenergy.com/t/12-200-bms/16652