Battery or Alternator problem - Page 2

MSS · 20th March 2019, 21:17

Unless you are confident in diagnosing electrical faults in cars, take the car to an auto electrician who should be able to diagnose the primary cause of your issues in 30 minutes.

It's not worth getting into the guessing game as that often leads to unnecessary expenditure.

marinabrian · 20th March 2019, 22:49

Fnipp, fnwurr, fnarple, check to see if the background illumination is lit on the light switch when the car is locked up.

A defective LSM will stop the BCU going into sleep mode, meaning the battery will discharge over the course of a day or two.

From memory this car had a gammy earth connection when you got it

I might be able to have a run down and take a look at it for you, but your readings you gave me of the battery across the terminals look to be ok.

Brian

Finbar1972 · 26th March 2019, 21:28

Brian

Is that the round switch that turns on the car lights?
No interior lights above head for map reading etc. are on when the car is locked.

Cheers
Lee

The car had not moved in 8 days and the voltage reading was still 12.4v (not started) and 14.4v when engine started.

bl52krz · 26th March 2019, 21:38

Have you checked to see if the connections on the battery are tight?If they are not, you will be getting faults all round when trying to start the car..

26th March 2019, 21:38	#14
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,387 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	Have you checked to see if the connections on the battery are tight?If they are not, you will be getting faults all round when trying to start the car.. __________________ Great Barr, Birmingham.

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20th March 2019, 21:17	#11
MSS This is my second home Rover 75CDT, Jaguar XF-S 3.0V6, V'xhall Omega V6 Estate, Twintop 1.8VVT, Astra Estate and Corsa 1.2 Join Date: Dec 2007 Location: Suffolk Posts: 7,083 Thanks: 283 Thanked 624 Times in 440 Posts	Unless you are confident in diagnosing electrical faults in cars, take the car to an auto electrician who should be able to diagnose the primary cause of your issues in 30 minutes. It's not worth getting into the guessing game as that often leads to unnecessary expenditure.

20th March 2019, 22:49	#12
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Fnipp, fnwurr, fnarple, check to see if the background illumination is lit on the light switch when the car is locked up. A defective LSM will stop the BCU going into sleep mode, meaning the battery will discharge over the course of a day or two. From memory this car had a gammy earth connection when you got it I might be able to have a run down and take a look at it for you, but your readings you gave me of the battery across the terminals look to be ok. Brian

26th March 2019, 21:28	#13
Finbar1972 Newbie Rover 75 Join Date: Jul 2016 Location: Hartlepool Posts: 14 Thanks: 0 Thanked 1 Time in 1 Post	Brian Is that the round switch that turns on the car lights? No interior lights above head for map reading etc. are on when the car is locked. Cheers Lee The car had not moved in 8 days and the voltage reading was still 12.4v (not started) and 14.4v when engine started.