Member Since: 09 May 2017
Location: HS65EB
Posts: 8
Battery light help please - Alternator or ..?
I’ve just joined but have been reading sections of the site for over a year.
I have several questions regarding my voltage readings. I’m hoping for some expert
guidance.
Battery light on after a 2 week stay at local garage - (bearing, drop link, abs ring followed
by oil ring & pressure sensor. The main car so took the hit as I needed it back quickly...did not appreciate the wait.)
Having payed out for many hours labour I took family on a 100 mile round trip – on return battery light comes on.
Drove back with forehead on steering wheel
I’ve checked battery and its holding 12.38V when off.
On cranking drops to over 10V.
Spike of 13/14ish Volts on cranking then settling to 13.49V.
I then added a load of Air con/stereo/lights and got a steady 13.53V
I realise the following Voltages may be from different locations within the engine but this is what I got:
Made a 20 mile trip first thing yesterday & it sat at 13.5V – no light on... then it came back.
I realise from many posts here that the alternator is the likely cause. But before I get one off ebay and set about trying to change it
myself I thought I’d see what you all thought?
Any help gratefully received.
11th May 2017 6:00 pm
Skynet
Member Since: 23 Jul 2014
Location: Melksham, Wiltshire
Posts: 868
Check the earthing cables too, I've heard it said that an extra earth cable helps in some instancesDave
D3 2006 HSE, Cairns Blue - gone
D4 2016 SE, White
Member Since: 09 May 2017
Location: HS65EB
Posts: 8
Appreciate that.
I'll check it out.
11th May 2017 6:15 pm
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
Also try charging the battery overnight if its not been used for over a fortnight it may need a boost to bring it back to full charge Discovery 3 se gone
Range rover sport supercharged here:)
11th May 2017 7:14 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
The light tells you you have a charging system problem - either the sense system (but not in this case as your alternator has not degraded into dumb mode) or the alternator (yep, this is the fault you have).
Disconnect the battery and give it a charge whilst you order a genuine alternator.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2080
You may have done this but check the battery cable connections are tight. I was having weird readings, went to check voltage at battery and the earth terminal was loose. ( Been at local independent a month before), tightened it up and is now OK.
11th May 2017 8:46 pm
avidd
Member Since: 09 May 2017
Location: HS65EB
Posts: 8
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