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Thread: Parasitic drain

  1. #1
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    Parasitic drain

    1992 xj6 sovereign with 136k

    battery was dead a few days ago in the morning. No obvious lights or otherwise left on. Have checked the battery and alternator before putting on the meter. I'm showing 182 mA draw. Pulled fuses in both foot wells and the center console. Also removed relays located in the engine bay. No change in the draw. I'm sure I'm probably missing some others.

    Recent items that could be related: I changed the wiper motor relay several weeks ago and the passenger seat belt restraint was sticking one day but then no more problems after that.

    Ive been reading threads on this issue and have been trying to follow the general protocol to tracking down the problem but would appreciate any suggestions. I'm not opposed to taking it somewhere but would rather see if I can rectify the problem on my own first.

    Thanks

  2. #2
    Senior Member rchiv's Avatar
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    Download the wiring diagram from http://www.jagrepair.com/JaguarXJ6XJ...OBDIIcodes.htm and trace permanent supply lines. You may have a drain through the alternator or starter motor.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 106K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

  3. #3
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    Could that get progressively worse? I just checked it this morning and it's showing 312 mA drain up from 182 mA

  4. #4
    Senior Member Jimbov8's Avatar
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    It can depending on the fault.
    Jim.
    2009 XK 5.0L PortfolioPast:-87'XJS 3.6L, 93'XJ40 3.2L gold, 95'XJ6 4.0L sport, 00'XJ8 3.2L sport, 2005 XK8 4.2L coupe in that order and enjoyed all of 'em.

    I do not offer advice, I only say what I would do with the set of circumstances presented. Your choice always.

  5. #5
    Senior Member rchiv's Avatar
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    Using a multimeter set to DCv measure the voltage across the battery terminals , it should be about 12.6v but may well be lower in your case. Disconnect the live lead and check voltage again. If you have a bad drain the battery will start to recover as the load is removed. Replace the lead and if you get an arc then you have a bad drain. Check relays to see if any are warm which would indicate that they have not de-energised. Then, with your multimeter connected to a live you need to pull fuses one at a time to see which (when removed) the voltage begins to rise. This movement will be immediate. Then you need to check that circuit.

    Roger

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 106K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

  6. #6
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    Quote Originally Posted by rchiv View Post
    Using a multimeter set to DCv measure the voltage across the battery terminals , it should be about 12.6v but may well be lower in your case. Disconnect the live lead and check voltage again. If you have a bad drain the battery will start to recover as the load is removed. Replace the lead and if you get an arc then you have a bad drain. Check relays to see if any are warm which would indicate that they have not de-energised. Then, with your multimeter connected to a live you need to pull fuses one at a time to see which (when removed) the voltage begins to rise. This movement will be immediate. Then you need to check that circuit.

    Roger

    Roger

    Well it turned out to be the alternator. Ordered a new one and just put it in. Everything is back to normal and she's on the road again. Thanks again to everyone for your help.

  7. #7
    Senior Member rchiv's Avatar
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    Thanks for the update, Glad you got it sorted.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 106K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

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