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Thread: 4.0 V6 alternator

  1. #1
    Join Date
    Jun 2010
    Location
    Central Coast NSW
    Posts
    1,798

    4.0 V6 alternator

    Hi all.

    Does the 4.0 petrol v6 alternator have the same issues as the diesel? As in, I'd the alternator dies, does it completely drain the battery?

    Car wouldn't start this morning. No warning, no slow starts. Just nothing but the tick of the relay when you try and start. All the dash lamps worked, the stereo worked, just wouldn't crank.

    I jump started it (properly) and it idled fine for 15mins. Turned it off and when i came back no go.

    I bought a new battery, and the guy at battery world measured 10.5v on the old battery. It was also bulging a little so i figured it was time for a new one anyway, but im a little stumped as to why it drained so low overnight.

    Cheers

    Dan
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  2. #2
    Join Date
    Jun 2009
    Location
    Sydney
    Posts
    1,567
    If the alternator has gone in the same way the D3, it pretty much kills the battery within minutes, if you put an new battery in it would kill that one too.
    Andrew
    ____________
    MY09 TDV6 SE

    Llams, ARB Bar, Warrior Winch, Snorkel, Traxide dual battery kit, Long Ranger Tank, Rear Wheel Carrier, GME UHF, Mitch Hitch, Rhino Platform Rack ++

    MY14 Jaguar F-Type V6S
    Ex D2 TD5 ES,
    Ex D1 300 TDI

  3. #3
    Join Date
    Jun 2010
    Location
    Central Coast NSW
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    1,798
    Thanks Andrew.

    Thats what im worried about. Are you confirming that its the same alternator and therefore has the same problem? If thats the case, do you know where i can find the thread on the mega fuse mod to stop it happening?

    Cheers

    Dan
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  4. #4
    Join Date
    Jun 2009
    Location
    Sydney
    Posts
    1,567
    No, I don't know, if it is the same.

    If you use the search tool in the bottom left of the screen, the Google aulro search, you should be able to find the fuse thread. But here are a varying opinions about whether it will work.
    Andrew
    ____________
    MY09 TDV6 SE

    Llams, ARB Bar, Warrior Winch, Snorkel, Traxide dual battery kit, Long Ranger Tank, Rear Wheel Carrier, GME UHF, Mitch Hitch, Rhino Platform Rack ++

    MY14 Jaguar F-Type V6S
    Ex D2 TD5 ES,
    Ex D1 300 TDI

  5. #5
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    6,867
    Hi Dan, you most likely have nothing wrong with your alternator.

    Your problem is that your ( 6 cell ) 12v battery is now a ( 5 cell ) 10.5v battery.

    Your battery has dropped a cell and this is not because of any mystery overnight drain, it is an almost instantaneous failure.

    The guy at Battery World should have told you your battery has dropped a cell.

  6. #6
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    6,867
    Hi again Dan and if your alternator was the problem, your battery would be down to 7v but would be rechargeable.

    At 10.5v, it's a dropped cell and the battery is no longer usable.

  7. #7
    Join Date
    Feb 2004
    Location
    Williams West Aust
    Posts
    21,012
    Quote Originally Posted by drivesafe View Post
    Hi Dan, you most likely have nothing wrong with your alternator.

    Your problem is that your ( 6 cell ) 12v battery is now a ( 5 cell ) 10.5v battery.

    Your battery has dropped a cell and this is not because of any mystery overnight drain, it is an almost instantaneous failure.

    The guy at Battery World should have told you your battery has dropped a cell.
    The bulging battery would also indicate what Tim is saying.Likely to be a short in that cell causing the bulge.Seen lots of it on earthmoving gear,especially if cheap batteries have been installed.
    Do Batteryworld use the same employment agency as Supercheap???
    Andrew
    DISCOVERY IS TO BE DISOWNED
    Midlife Crisis.Im going to get stuck into mine early and ENJOY it.
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  8. #8
    Join Date
    Jan 1970
    Location
    Queensland
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    6,867
    Quote Originally Posted by LandyAndy View Post
    Do Batteryworld use the same employment agency as Supercheap???
    Andrew
    Very funny but o so true

  9. #9
    Join Date
    Jun 2010
    Location
    Central Coast NSW
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    1,798
    Quote Originally Posted by LandyAndy View Post
    Do Batteryworld use the same employment agency as Supercheap???
    Andrew
    Haha the guy was actually really good! Way better than supercheap!

    He didnt commit to any diagnosis but did say it had likely dropped a cell, though it would take him until Monday to try and charge it then test.

    Thanks Tim and Andy's. I dont know much about batteries and have a basic understanding of electronics. I did figure the alternator was ok as the car ran on a dud battery. Didnt know a battery could drop a cell overnight tho!

    Im still a bit concerned about the alternator going south and taking the battery with it. I will have a look at part numbers (if i can find them) but if anyone else knows feel free to comment

    Cheers

    Dan
    '08 D3 4.0 V6 :) - 265/65/R17 on X5 rims.
    FINN - '72 88" S3 - 2.286 petrol - yet to go on it's first adventure
    GONE '96 D1 300Tdi - 2" lift, 32" tyres, HD rear axles, lockers :(

  10. #10
    Join Date
    May 2007
    Location
    Byford, WA
    Posts
    1,318
    Hi Dan,
    I have had three people drop cells this week at work, came into work fine in the morning, lights on etc, come to go home, nothing flat as a fluke. Could well be temperature related......it is summer well at least for another two days.

    Cheers Marty.
    "Keep the shiney side up"

    All the very best Marty

    2012 Defender 90 Puma (Present)
    1999 Defender TD5 (Present)
    2004 Disco 2 TD5 Gone
    2005 RRS 4.4 V8 Gone
    2003 RR L322 4.4 V8 Gone

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