Battery drain problem advice please

Mangizmo · 12th February 2017, 18:44

Hi, not my car but my father-in -Laws car, here is how he describes the problem, any ideas ??

2005 Rover 75. Cdti. Has a new good quality Heavy Duty Battery; and a new Bosch Alternator. Charging checked, all correct.
If car left for,say a week, then will not turn over and start, have known as little as three days, for the same result. A meter check showed a drain of 18 Amps, after boost started, then engine switched off. Left on charge over night, started on battery, switched off, then retested. This showed a drain of 1.4 amps. This appears to be an intermittent problem.

Thanks V

kaiser · 12th February 2017, 20:18

If you look for these problems, it is good if you can catch it with a high consumption. Then remove fuses systematically, and find out in which circuit the heavy drain mainly takes place.

This is a instance where a helper is a good idea.

cb750chris · 12th February 2017, 20:22

Does this car have a built in sat nav? That could be causign a battery drain by not shutting down properly.

Nev The Bear · 12th February 2017, 20:22

Quote:

Originally Posted by Mangizmo

Hi, not my car but my father-in -Laws car, here is how he describes the problem, any ideas ??

2005 Rover 75. Cdti. Has a new good quality Heavy Duty Battery; and a new Bosch Alternator. Charging checked, all correct.
If car left for,say a week, then will not turn over and start, have known as little as three days, for the same result. A meter check showed a drain of 18 Amps, after boost started, then engine switched off. Left on charge over night, started on battery, switched off, then retested. This showed a drain of 1.4 amps. This appears to be an intermittent problem.

Thanks V

If Highline Sat Nav is fitted might be worth checking the sat nav disc drive is shutting down correctly. This was a problem I had with my ZTT a while ago which was causing a drain on the battery.

Gareth.Richards · 12th February 2017, 22:02

Quote:

Originally Posted by Mangizmo

Hi, not my car but my father-in -Laws car, here is how he describes the problem, any ideas ??

2005 Rover 75. Cdti. Has a new good quality Heavy Duty Battery; and a new Bosch Alternator. Charging checked, all correct.
If car left for,say a week, then will not turn over and start, have known as little as three days, for the same result. A meter check showed a drain of 18 Amps, after boost started, then engine switched off. Left on charge over night, started on battery, switched off, then retested. This showed a drain of 1.4 amps. This appears to be an intermittent problem.

Thanks V

Does it have a Fuel Burning Heater?, I had a similar issue on my 2002 CDT, I unplugged the FBH and bingo no battery drain issues. Worth a look at though.
Gareth

stevenicks · 13th February 2017, 06:33

I had the same problem when the car was left standing for any length of time. I bought a solar charger off eBay for about £15. Not had a problem since, even in the very cold weather

.

Mike Noc · 13th February 2017, 06:54

Faulty CD multichanger in the boot was the cause of my battery drain. As mentioned pull the fuses one at a time until you find the drain.

marinabrian · 13th February 2017, 08:10

As a quick check, see if the LSM backlighting remains illuminated when the car is locked up

Seen this on more than a few occasions now, and it prevents the BCU from entering sleep mode

Brian

Catman · 11th October 2017, 11:38

Quote:

Originally Posted by marinabrian

As a quick check, see if the LSM backlighting remains illuminated when the car is locked up

Seen this on more than a few occasions now, and it prevents the BCU from entering sleep mode

Brian

Hi Brian, I have just this problem, any idea of the cure

Cheers Paul.

cb750chris · 11th October 2017, 11:46

The cure is going to be a replacement light switch module.
If you just fit a 2nd hand one then the chances are your dash will put a warning up on the trip counter to show there is a mileage mismatch.
There are a number of members on here who will be able to code you a replacement light switch up, Brian and myself amongst them.
Regards
Chris

12th February 2017, 18:44	#1
Mangizmo Gets stuck in Rover 75 Tourer Join Date: Aug 2013 Location: Barnstaple Posts: 764 Thanks: 154 Thanked 235 Times in 127 Posts	Battery drain problem advice please Hi, not my car but my father-in -Laws car, here is how he describes the problem, any ideas ?? 2005 Rover 75. Cdti. Has a new good quality Heavy Duty Battery; and a new Bosch Alternator. Charging checked, all correct. If car left for,say a week, then will not turn over and start, have known as little as three days, for the same result. A meter check showed a drain of 18 Amps, after boost started, then engine switched off. Left on charge over night, started on battery, switched off, then retested. This showed a drain of 1.4 amps. This appears to be an intermittent problem. Thanks V

12th February 2017, 20:18	#2
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	If you look for these problems, it is good if you can catch it with a high consumption. Then remove fuses systematically, and find out in which circuit the heavy drain mainly takes place. This is a instance where a helper is a good idea. __________________ Worth his V8 in gold

12th February 2017, 20:22	#3
cb750chris Trader Rover 75 Tourer Join Date: Apr 2011 Location: Portsmouth Posts: 849 Thanks: 201 Thanked 292 Times in 200 Posts	Does this car have a built in sat nav? That could be causign a battery drain by not shutting down properly. __________________ Now offering T4 services in the Fareham area Replacement keys programmed / supplied / cut Diesel 135 upgrade available IPK virginisation and T4 matching available Sorry, due to a big change in home circumstances, I am unable to do any large jobs at present, but can still offer evening time diagnostics.

13th February 2017, 06:33	#6
stevenicks This is my second home MG ZT 180 Auto / Rover 75 2.0 Diesel Join Date: Apr 2013 Location: Brecon. Posts: 7,465 Thanks: 3,297 Thanked 1,666 Times in 1,264 Posts	I had the same problem when the car was left standing for any length of time. I bought a solar charger off eBay for about £15. Not had a problem since, even in the very cold weather . __________________ "You're Not Laughing Now Are You?" Steve

11th October 2017, 11:46	#10
cb750chris Trader Rover 75 Tourer Join Date: Apr 2011 Location: Portsmouth Posts: 849 Thanks: 201 Thanked 292 Times in 200 Posts	The cure is going to be a replacement light switch module. If you just fit a 2nd hand one then the chances are your dash will put a warning up on the trip counter to show there is a mileage mismatch. There are a number of members on here who will be able to code you a replacement light switch up, Brian and myself amongst them. Regards Chris __________________ Now offering T4 services in the Fareham area Replacement keys programmed / supplied / cut Diesel 135 upgrade available IPK virginisation and T4 matching available Sorry, due to a big change in home circumstances, I am unable to do any large jobs at present, but can still offer evening time diagnostics.

13th February 2017, 06:54	#7
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,548 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Faulty CD multichanger in the boot was the cause of my battery drain. As mentioned pull the fuses one at a time until you find the drain.

13th February 2017, 08:10	#8
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	As a quick check, see if the LSM backlighting remains illuminated when the car is locked up Seen this on more than a few occasions now, and it prevents the BCU from entering sleep mode Brian