Voltage drain





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Thread: Voltage drain

  1. #1
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    Default Voltage drain

    For the past while, my battery will go flat at the drop of a hat, sometimes it will be fine after a week, and sometimes it doesn't last two days.
    Besides my thermo fan, which only works when the car is running, I've disconnected everything that I had fitted aftermarket, and wired to the battery, so eliminating them as a power drain.
    Still the same problem, so I disconnected the negative lead and put a test light inline and it is lit up. (See pics.) I've systematically removed EVERY fuse one by one to check where the fault lies, and the only one that makes any difference is when I pull the 30amp fuse? (see pic) that according to the fuse box label is for the cabin fuse box, but this does not entirely remove the drain, it just brings the test light down to a glimmer??
    I have been told by two mechanics that the symptoms are the dreaded TRACKING unit, now as far as I am aware, my car doesn't have one, that I know of, but it did use to belong to Imperial Car rental, so this is a distinct possibility.
    My next question is: How the hell do I find it,if indeed there is one? I am not to keen to take all the panels out to look for something that I don't even know what it looks like!
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    09 Kyron, the Korean Snail.
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  2. #2
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    Default Re: Voltage drain

    Ask them which brand was fitted and have them remove it.
    There is no task too simple for some people to complicate !



    Ford Figo 2016

  3. #3
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    Default Re: Voltage drain

    Post a pic of your positive terminal and all the wires connected to it.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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    Default Re: Voltage drain

    Before doing a battery drain test, you should wait at least 10 minutes for the PCM to go to sleep mode. If the bonnet have a switch, you must bridge it as well.

    Remove the alternator fuse(150A) and see if there is a change. If so, then there is a blown diode in the alternator.

    It is also better to use a multimeter or clamp meter to give more accurate readings.
    98 Hilux 2.8D D/C 4x4

  5. The Following User Says Thank You to wiel For This Useful Post:


  6. #5
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    Default Re: Voltage drain

    I had the same problem , here are my results

    https://www.4x4community.co.za/forum...y-battery-flat

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    Thumbs up Re: Voltage drain

    Quote Originally Posted by wiel View Post
    Before doing a battery drain test, you should wait at least 10 minutes for the PCM to go to sleep mode. If the bonnet have a switch, you must bridge it as well.

    Remove the alternator fuse(150A) and see if there is a change. If so, then there is a blown diode in the alternator.

    It is also better to use a multimeter or clamp meter to give more accurate readings.
    Dumb question/s: a) the car had stood since yesterday, so theoretically the PCM should have been asleep. How do I Bridge the bonnet switch? can I just unplug the wire from it? and if i remove the alternator fuse and diode is kaput, should the light then go out?
    09 Kyron, the Korean Snail.
    NO Meeow!
    Blanked EGR.
    Thermo Electric Cooling fan.

  8. #7
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    Thumbs up Re: Voltage drain

    Quote Originally Posted by duncang View Post
    Ask them which brand was fitted and have them remove it.
    I've owned the car for 7 years now! I doubt they will know?
    09 Kyron, the Korean Snail.
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    Blanked EGR.
    Thermo Electric Cooling fan.

  9. #8
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    Smile Re: Voltage drain

    As requested, positive terminal. ignore the thin red wire, that runs to the thermo switch.
    Have tried with all doors shut, bonnet switch in the off position, and with the alternator fuse removed, the test light is still on.
    I do not have a multimeter, and to be quite honest, the last time I worked on a car, it was straight 12 volts! None of this fancy stuff about which I know zip!
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    09 Kyron, the Korean Snail.
    NO Meeow!
    Blanked EGR.
    Thermo Electric Cooling fan.

  10. #9
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    Default Re: Voltage drain

    A friend recently had a tracking company look for over 5 hours for his tracker. They phoned all over to find the person who installed it and no luck. The tracking company wanted to upgrade it.

    What I would do is to disconnect the earth on the battery and wire 2 leads to a multimeter o amp scale. Use a needle meter that will not go to sleep after some time. Route the wires to the outside of the car. Close the bonnet and lock the car as ussual. Then get a spare cell phone with camera with a APP that takes picture like every 3 seconds. This way one is bound to see if there is a above normal current as some stage even if it is only intermittend.
    Last edited by ekkekan; 2020/05/20 at 02:35 PM.

  11. #10
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    Default Re: Voltage drain

    Quote Originally Posted by wiel View Post
    Remove the alternator fuse(150A) and see if there is a change. If so, then there is a blown diode in the alternator.
    I'm starting to get the same feeling.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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    Default Re: Voltage drain

    Quote Originally Posted by Markb View Post
    Dumb question/s: a) the car had stood since yesterday, so theoretically the PCM should have been asleep. How do I Bridge the bonnet switch? can I just unplug the wire from it? and if i remove the alternator fuse and diode is kaput, should the light then go out?
    If ign was off the whole time yes, but there is also a BCM (body control unit) that is activated the moment a door open. Both of them stay activated for a few minutes when the ign is switched off.

    If you unplug the bonnet switch, the circuit stays open, which is the same as a open bonnet. You must bridge the two wires in the switch to simulate a closed bonnet. Otherwise take a screwdriver and push the bonnet lock close.

    If the light goes dim with the alternator disconnected , then the alternator is faulty.

    You really need to get hold of a multimeter. A test light cant tell you how many amps/ milliamps are drawn, and that is what you want to know.
    98 Hilux 2.8D D/C 4x4

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    Exclamation Re: Voltage drain

    After much head scratching, and searching, fuse and relay pulling, I "Think" I may have got to the bottom of the problem
    The other night at about 8ish, I went out to take the battery off charge, and reconnect the negative terminal.
    Now as I did this, I heard a faint but very distinct click.
    So this morning I decided to hunt down the sound, and after much prodding an poking, and by using a long piece of brake pipe, I found the thingie that clicks and then hums when I connect the battery! PROBLEM!!! I have absolutely NO idea of what it is, or how to even get at it!
    There are two connections on the rear of the fuel pump, which is of course hidden under the intake manifold, EGR, and some other bits and bobs.
    By dint of putting my listening tube on one or other connector, the click and then constant humming is very distinct! There is a green and a black connector, and the noise is most audible on the black one.
    Now just to find out what the hell they are, and how to fix it! Because I'm not sure if it is something else switching these things on, or what??
    09 Kyron, the Korean Snail.
    NO Meeow!
    Blanked EGR.
    Thermo Electric Cooling fan.

  14. #13
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    Thumbs down Re: Voltage drain

    Adding to my previous post!
    Took the Snail to my diesel tech/auto electrician, and he put an ammeter on between the negative post and the earth strap.
    Started off with a 2.75amp reading, then quickly settled down to .5 amp draw?? We checked everything we could find, short of removing panels, and nothing!
    This really has me by the balls now!
    Oh and the click and hum, is the fuel pressure sensor, behaving perfectly normally!
    09 Kyron, the Korean Snail.
    NO Meeow!
    Blanked EGR.
    Thermo Electric Cooling fan.

  15. #14
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    Default Re: Voltage drain

    Mark the fuel pressure sensor shouldnt be drawing any current if the ignition is off

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    Smile Re: Voltage drain

    Quote Originally Posted by MikeBob View Post
    Mark the fuel pressure sensor shouldnt be drawing any current if the ignition is off
    That's what I thought, and apparently it is only drawing when I reconnect, then it stops, and I'm left with the .5 amp draw
    09 Kyron, the Korean Snail.
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    Blanked EGR.
    Thermo Electric Cooling fan.

  17. #16
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    Default Re: Voltage drain

    Quote Originally Posted by Markb View Post
    That's what I thought, and apparently it is only drawing when I reconnect, then it stops, and I'm left with the .5 amp draw
    have you tried unplugging it to see what draw you then get?

  18. #17
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    Default Re: Voltage drain

    I have mentioned before one of my cars had a faulty radio that needed current to store preset stations.
    There is no task too simple for some people to complicate !



    Ford Figo 2016

  19. #18
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    Default Re: Voltage drain

    So far all sounds normal.
    Fuel pump will try to maintain pressure in the system even if the ignition is off, same like an electric fan.

    To be honest, 0.5Amp at 12V is really nothing! That is only 6W.
    This is about what is needed to keep all the computers and systems active.
    For a 65AH battery, you would need around 5 days to drain your battery at 0.5A.

    Battery. Looks like 2019?
    When last did you have it tested?

    As mentioned, get a decent volt meter to check battery voltage and to see if the alternator is really charging?

    Also have a look at aftermarket radios.


    2007 Nissan Navara 4L Auto - Worshond


  20. #19
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    Thumbs up Re: Voltage drain

    [QUOTE=Wetkit;4403682]So far all sounds normal.
    Fuel pump will try to maintain pressure in the system even if the ignition is off, same like an electric fan.

    To be honest, 0.5Amp at 12V is really nothing! That is only 6W.
    This is about what is needed to keep all the computers and systems active.
    For a 65AH battery, you would need around 5 days to drain your battery at 0.5A.

    Battery. Looks like 2019? Yup JUne 2019, Solite, so it's a good battery
    When last did you have it tested? January, by the agents, said it was fine

    As mentioned, get a decent volt meter to check battery voltage and to see if the alternator is really charging? Now disconnected, but have a permanent volt meter in the car, and it shows 14.7 while driving, and down to 12.7 standing.

    Also have a look at aftermarket radios. Car is completely original.
    09 Kyron, the Korean Snail.
    NO Meeow!
    Blanked EGR.
    Thermo Electric Cooling fan.

  21. #20
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    Default Re: Voltage drain

    Eish, I am out of ideas....


    2007 Nissan Navara 4L Auto - Worshond


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