1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Welcome To LandyZone!

    LandyZone is the biggest Land Rover forum on the net. We have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.

    Registering is free and easy just click here, we hope to see you on the forums soon!

classic battery warning light

Discussion in 'Range Rover' started by billrand, Jan 15, 2015.

< Previous Thread | Next Thread >
  1. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    hi guys just wondering if anyone could shed some light on a battery warning light that has suddenly appeared, soft glow on tick over and brightens as revs increased

    Just checked battery with meter holding 12.2v and when on tickover showing 14.1.14.2v , but light still faint glow and brighter when revved?
     
    Last edited: Jan 15, 2015
  2. ukadamwest

    ukadamwest Well-Known Member

    Joined:
    Feb 28, 2012
    Posts:
    2,390
    Likes Received:
    481
    Location:
    Surrey
  3. West Slope Rover

    West Slope Rover Well-Known Member

    Joined:
    Aug 9, 2010
    Posts:
    8,617
    Likes Received:
    1,513
    Location:
    deep underground
    What is the voltage when the car is running at higher revs?
     
  4. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    V holds steady at 14.4 ish when revved
     
  5. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    30,717
    Likes Received:
    867
    Location:
    Near Poitiers SW France
    Check all the connections. Probably a diode failure in the regulator.
     
  6. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    ok if it is does this mean the battery is not charging properly, and its not a rush job or do i need to get on it : )
     
  7. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
  8. ukadamwest

    ukadamwest Well-Known Member

    Joined:
    Feb 28, 2012
    Posts:
    2,390
    Likes Received:
    481
    Location:
    Surrey
  9. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    Just checked battrery again and seems fine holding 12.6v and charging 13.8>14,3v, noticed warning light also gets brighter when load applied ie indicators it flashes, lights heater etc
    What exactly do the diodes do? if battery ok and charging is it essential i replace the pack on alternator :)
     
  10. ukadamwest

    ukadamwest Well-Known Member

    Joined:
    Feb 28, 2012
    Posts:
    2,390
    Likes Received:
    481
    Location:
    Surrey
    The positive end of a diode is the anode, and the negative end is the cathode. Current can flow from the anode end to the cathode, but not the other direction. Think of it like a non-return valve.
     
  11. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    30,717
    Likes Received:
    867
    Location:
    Near Poitiers SW France
    The charge light provides the excitation current to kick the alternator into life, thence as the voltage rises at the alternator, the light goes out as it has 12 volts on each end.
    As you have a Classic, I would expect the maximum charge voltage to be 13.8 volts, the fact that it's getting up to 14.3v suggests that the regulator is not working. In the extreme, it could cook the battery or burn out the armature of the alternator, depends on exactly what is going on.
     
  12. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    ok cool thanks : ) so would appear no great rush to sort the snag as battery and alternator seem to be working ok?
    will check tomorrow though if that voltage regulator will fit my alternator
     
  13. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    30,717
    Likes Received:
    867
    Location:
    Near Poitiers SW France
    Personally I would not leave it, as I said damage could result.
     
  14. winchman

    winchman Active Member

    Joined:
    Nov 2, 2005
    Posts:
    635
    Likes Received:
    50
    Location:
    A little fishing Village ner St.Helens Merseyside
    I agree first job is check Earths as this may have caused the problem in the first place
     
  15. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    Sorry Datatek completly missed your post , ok im on it will see if i can get a new regulator if my alternator has a seperate one fitted
     
  16. Datatek

    Datatek Well-Known Member

    Joined:
    Feb 5, 2009
    Posts:
    30,717
    Likes Received:
    867
    Location:
    Near Poitiers SW France
    The regulator is built into the alternator, but easy to replace. Get one with a set point of 14.2 to 14.5 volts to suit modern battery technology:)
     
  17. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    Thanks one and all, my alternator is RTC5680e, so i am getting the regulater mentioned earlier in the thread equivalent to rtc5670? can anyone point me to any intructions on how to replace it :)
    thanks in advance
     
  18. ukadamwest

    ukadamwest Well-Known Member

    Joined:
    Feb 28, 2012
    Posts:
    2,390
    Likes Received:
    481
    Location:
    Surrey
    Looking at the rear of the alternator it fits into a slot in the back. looking at the regulator it looks like three screws hold it in place and it slides out in line with the connectors.
     
  19. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    ok brill thanks , one last stupid question lol is it possible to do with alternator in situ : )
     
  20. billrand

    billrand Member

    Joined:
    Nov 9, 2014
    Posts:
    59
    Likes Received:
    0
    i lied :) given a choice britpart,allmakes or bearmach obviously land rover oem out of the question cost wise lol
     
< Previous Thread | Next Thread >