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Thread: Battery keeps going flat on Signum

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    Default Battery keeps going flat on Signum

    HI all, I've got a Signum Diesel and for the last year the battery has been a pain in the backside, I've have 2 new batteries all the tests done on the alternator but it's charging fine.

    The battery seems to go flat after 2 days of being stood for no reason at all, there are no lights on when I lock the motor up.

    Any ideas chaps??

  2. #2
    Full Member bobssignum's Avatar
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    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

    Default

    You have a short somewhere in your electrics which is draining the battery , what else have you had problems with lately as that could give you a clue to what is causing the battery drain
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    Quote Originally Posted by bobssignum View Post
    You have a short somewhere in your electrics which is draining the battery , what else have you had problems with lately as that could give you a clue to what is causing the battery drain
    I've been having problems with the screenwash motor.

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    Regular Member Ziggy's Avatar
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    Vehicle : Saab

    Trim : 9-3 Vert

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    Have you checked the boot light isnt on or something simple like that?

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    Quote Originally Posted by s_zigmond View Post
    Have you checked the boot light isnt on or something simple like that?

    Yes mate nothing is on when I lock up.

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    Regular Member Das's Avatar
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    Check the glove box light as well, maybe the switch for it has taken knock and its permanently on.

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    Ex Vec-C Admin Ian-Highlander's Avatar
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    Vehicle : Insignia Tourer

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    As I recall there's a known issue with some versions of one of the models of radios draining power too, I don't remember which though, someone will no doubt have more info than I do to hand.
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    Quote Originally Posted by DasArab View Post
    Check the glove box light as well, maybe the switch for it has taken knock and its permanently on.

    I'll give that a go when I can get it started. Cheers for the reply.

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    Quote Originally Posted by Ian-Highlander View Post
    As I recall there's a known issue with some versions of one of the models of radios draining power too, I don't remember which though, someone will no doubt have more info than I do to hand.
    That's the next one I was coming to the radio issue. I'm going to try and disconnect it and see where we go from there.

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    Regular Member Grimy's Avatar
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    You need to check the current draw on the car with everything turned off and preferably with the car locked.

    You will need an Amp meter with a range of at least 10Amps. If your using a multimeter, check your test leads plugged into the correct socket on the meter if its the older type, and set the meter to 0-10Amp DC. With everything off, disconnect the positive lead from the battery and attach the black test lead to it. Touch the red test lead onto the battery positive terminal and read off the current.

    Any more than 1amp and you have something draining the battery. Remember current= watts / Voltage so a small 5w lamp will pull:-

    I = 5 watts / 12 volts = 0.417 amperes

    Your clock and other random ancillerys will draw a small amout when parked, but you shouldnt have much more than say half an amp.

    A common fault is the rectifier diodes in the alternator failing and becoming a dead short, this then causes the alternator windings to draw current. but it could be anything...

    If pulling fuses out for each circuit to eliminate the fault dosent see a current drop, you need to get the alternator checked out.

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