V50: - part attached to battery N- Terminal

davesmiff · Jan 7th, 2022, 12:10

I have searched for this question and can't get a result.
Please could you tell me what the little black box is, that is attached to the negative terminal on the battery (it has 2 wires conected to it). What does it do? I have a volvo V50 11 years old.
Thanks in advance

Dave

Petey80 · Jan 7th, 2022, 12:27

That will be the Battery Monitoring Sensor/BMS and it measures the voltages on the battery etc.

davesmiff · Jan 7th, 2022, 13:39

I have been told that if I charge the battery,Ihave to connect the + to the battery and the N- to the chassis Not the battery direct so charge goes through the thing ? Is this correct ?

Tannaton · Jan 7th, 2022, 14:43

As said above it's the shunt from where the battery monitoring system gets its data.

And yes, when charging the +ve lead goes direct to the battery terminal and -ve to the chassis - this does not affect battery charging but means the BMS system recognises the charge.

davesmiff · Jan 8th, 2022, 11:25

Thanks for your prompt and infrormative replies.

Dave

Jan 7th, 2022, 12:10	#1
davesmiff New Member Last Online: Jan 8th, 2022 11:25 Join Date: Aug 2015 Location: leeds	part attached to battery N- Terminal I have searched for this question and can't get a result. Please could you tell me what the little black box is, that is attached to the negative terminal on the battery (it has 2 wires conected to it). What does it do? I have a volvo V50 11 years old. Thanks in advance Dave

Jan 7th, 2022, 12:27	#2
Petey80 Premier Member Last Online: Apr 25th, 2024 20:13 Join Date: Feb 2017 Location: North East, Teesside	That will be the Battery Monitoring Sensor/BMS and it measures the voltages on the battery etc. __________________ Thread V40 T2 R-Design - https://www.volvoforums.org.uk/showt...56#post2901756 Thread V50 D2 R-Design - https://www.volvoforums.org.uk/showthread.php?t=264890 - CRASHED

Jan 7th, 2022, 13:39	#3
davesmiff New Member Last Online: Jan 8th, 2022 11:25 Join Date: Aug 2015 Location: leeds	battery sensor ? I have been told that if I charge the battery,Ihave to connect the + to the battery and the N- to the chassis Not the battery direct so charge goes through the thing ? Is this correct ?

Jan 7th, 2022, 14:43	#4
Tannaton Bungling Amateur Last Online: Today 00:22 Join Date: Aug 2014 Location: Beverley, East Yorks	As said above it's the shunt from where the battery monitoring system gets its data. And yes, when charging the +ve lead goes direct to the battery terminal and -ve to the chassis - this does not affect battery charging but means the BMS system recognises the charge. __________________ 2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1977 Triumph Spitfire 1500 1976 Massey Ferguson 135

Jan 8th, 2022, 11:25	#5
davesmiff New Member Last Online: Jan 8th, 2022 11:25 Join Date: Aug 2015 Location: leeds	Thanks for your prompt and infrormative replies. Dave

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