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Themoog

Member Since: 27 Apr 2018
Location: Cambridge
Posts: 262

2005 Range Rover Sport Supercharged Rimini Red

Red battery light

Two days ago I put the RRSS battery on a trickle charge for about 4 hrs as the car doesn't get used too much and when it does it's only short journeys.
All good until tonight when the wife went to pick up our 17 yr old daughter from work which is 600 metres away. Don't get me started on why she won't walk or cycle.. Anyway, she came in and said the red battery light has come on.
See what I mean about short journeys? Why would the light suddenly come on?
Any ideas before I take a look at it tomorrow.

Mon Nov 05 2018 9:29pm

Tyrefitter

Member Since: 19 Jul 2015
Location: Bridlington East Yorkshire
Posts: 3677

2013 Range Rover Sport SDV6 Autobiography Fuji White

Mine comes on every time I stop the car,I think it’s something to do with the dash cam as it’s ever since I fitted it & it did the same in my other L494.Even if I leave on charge all day the day after the light appears again also if I give it a 3-4 hour run as soon as I stop the car the light appears,I think it’s only the small battery for the stop start in the rear that’s causing the problem as I’ve never had a problem starting the car.

Andy. Andy.
21 Ford Ranger
Gone but not forgotten
Focus RS Red Edition
2015 RRS AB Fuji.
2014 RRS SC Santorini
2016 VW Amarok
2014 RRS AB Fuji
2012 RRS Red Edition Fuji
2015 Nissan Navara
2012 RRS SE Santorini
2008 RRS White
2007 RRS Santorino

Mon Nov 05 2018 11:35pm

garrycol

Member Since: 30 Nov 2010
Location: Canberra
Posts: 1068

Most likely a failed alternator. 07MY RRS TDV6
Arctic Frost
Aspen Interior

Tue Nov 06 2018 4:57am

Themoog

Member Since: 27 Apr 2018
Location: Cambridge
Posts: 262

The battery had 12.1 volts before starting this morning. It was 13.48 for the first two minutes all ok and then there was a whining noise from alternator I assume and voltage was 13.05 and dropping..
Odd timing as I charged the battery the other day. Could that have damaged something?

Tue Nov 06 2018 7:39am

Themoog

Member Since: 27 Apr 2018
Location: Cambridge
Posts: 262

Strange that the alternator would fail as soon as I charged the battery. Its goin in on Thurs anyway. I have a funny feeling its the battery. I don't know why tho.

Tue Nov 06 2018 3:01pm

Themoog

Member Since: 27 Apr 2018
Location: Cambridge
Posts: 262

Well I have just had it running for 20min on the drive. The voltage across the battery showed 12.1 V. After a while there were all sorts of bongs from the dash and all the warnings came on - I assume these were because the battery was only at 11.8v by then. I stopped it but it restarted no probs. I've got the battery on charge again as I need to drive it to the garage on Thurs.

Tue Nov 06 2018 4:08pm

gogsy1956

Member Since: 15 Jun 2013
Location: Tyne and Wear
Posts: 948

2010 Range Rover Sport TDV8 HSE Bali Blue

I would expect to see 14.4V or thereabouts if the alternator was performing correctly,, even if the battery was duff. The car won't run for very long if the battery is not getting any charge 2010 RRS, TDV8
bali Blue / colour coded
side steps / flappy paddles
black perforated leather
22" overfinch
heated everything, TV,fridge ...... now with gold calipers and mud flaps !( black mud flaps that is) !!
Many years ago,,,,, 1955 series 1 landie , sometimes wish I had kept it

Tue Nov 06 2018 4:45pm

jimbg

Member Since: 29 Jan 2013
Location: By the River Dart
Posts: 1843

2013 Range Rover Sport SDV6 HSE Orkney Grey

Themoog wrote:
The battery had 12.1 volts before starting this morning. It was 13.48 for the first two minutes all ok and then there was a whining noise from alternator I assume and voltage was 13.05 and dropping..
Odd timing as I charged the battery the other day. Could that have damaged something?

12.1 volts indicates around 45% charge. 2023 P440e SE Dynamic on order -cancelled

2022 HSE Dynamic P400e

2017 Discovery 3.0 HSE Silicon Silver Nimbus interior and a few extra toys SOLD

2013 HSE Black, Orkney Grey, Ebony Seats and Ivory Interior SOLD

2006 HSE

Plus a few other cars inbetween!

Tue Nov 06 2018 5:06pm

garrycol

Member Since: 30 Nov 2010
Location: Canberra
Posts: 1068

Themoog wrote:
Well I have just had it running for 20min on the drive. The voltage across the battery showed 12.1 V. After a while there were all sorts of bongs from the dash and all the warnings came on - I assume these were because the battery was only at 11.8v by then. I stopped it but it restarted no probs. I've got the battery on charge again as I need to drive it to the garage on Thurs.

That is symptomatic of a failed alternator - I had this earlier this year - will generate power sometimes but not all the time - dash lights and gongs. Car would still start and move but all sorts of failures. 07MY RRS TDV6
Arctic Frost
Aspen Interior

Tue Nov 06 2018 10:47pm

RRSTDV8

Member Since: 12 Aug 2011
Location: Northamptonshire
Posts: 9001

2012 Range Rover Sport SDV6 HSE Orkney Grey

Themoog wrote:
Well I have just had it running for 20min on the drive. The voltage across the battery showed 12.1 V. After a while there were all sorts of bongs from the dash and all the warnings came on - I assume these were because the battery was only at 11.8v by then. I stopped it but it restarted no probs. I've got the battery on charge again as I need to drive it to the garage on Thurs.

If it only had 12.1V across it with the engine running then the alternator is

. The loss of charge whilst running is also indicative of that. The battery could be damaged too by now, sadly. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

Wed Nov 07 2018 12:08am

Themoog

Member Since: 27 Apr 2018
Location: Cambridge
Posts: 262

Twas a failure of the alternator. Purely coincidental. Cost £500.. Im not putting a battery charger on it ever again..
The door locks are automatically locking when driving off now and they weren't before. I'm not sure if i like it that way so how do I change the function?

Mon Nov 12 2018 4:08pm

gogsy1956

Member Since: 15 Jun 2013
Location: Tyne and Wear
Posts: 948

You can disable the function on the dashboard menu 2010 RRS, TDV8
bali Blue / colour coded
side steps / flappy paddles
black perforated leather
22" overfinch
heated everything, TV,fridge ...... now with gold calipers and mud flaps !( black mud flaps that is) !!
Many years ago,,,,, 1955 series 1 landie , sometimes wish I had kept it

Mon Nov 12 2018 5:47pm

garrycol

Member Since: 30 Nov 2010
Location: Canberra
Posts: 1068

Themoog wrote:
Twas a failure of the alternator. Purely coincidental. Im not putting a battery charger on it ever again..

Was nothing to do with a battery charger - there are no issues with putting on a charger with the battery in the car if it is done correctly. +ive on the +ive side of the battery and -ive on the earthing post near the battery, not on the -ive post of the battery.

Garry 07MY RRS TDV6
Arctic Frost
Aspen Interior

Mon Nov 12 2018 10:48pm

Themoog

Member Since: 27 Apr 2018
Location: Cambridge
Posts: 262

Yeah well I won't trust it again.. Ive been doing it for years and never had a problem before. Next time I will just buy a new battery its cheaper..

Tue Nov 13 2018 7:02am

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