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BATTERY DRAIN F512M

Discussion in 'Boxers/TR/M' started by HOU, Nov 3, 2019.

  1. HOU

    HOU Karting

    May 2, 2009
    86
    Houston, Texas
    Full Name:
    John S
    my 66K mi. M has developed a significant battery drain
    overnight the voltage reads 11.4 at the engine starter terminal
    the battery is new interstate

    any suggestions where i should look first ?

    thanks in advance.........
    john s
     
  2. Shamile

    Shamile F1 Veteran
    Silver Subscribed

    Dec 31, 2002
    6,563
    Lakeland FL
    Full Name:
    Shamile
    The only thing that comes to mind is that your alternator has gone bad and one of the electronic internals...rectifier? is passing through the current...something like that.

    I had that happen on a 308 gtsi I owned a gazillion years ago. A rebuild of the alternator solved the problem.

    Shamile

    Freeze....Miami Vice!

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    Natkingcolebasket69 likes this.
  3. Rifledriver

    Rifledriver Two Time F1 World Champ

    Apr 29, 2004
    26,949
    Austin TX
    Full Name:
    Brian Crall
    Put an amp meter between the battery and the car and start pulling fuses until draw goes down to normal (25mA or so). That will narrow it down quickly. As I recall ignition, the Motronic boxes and starting/charging systems are the only unfused systems. The most common culprits are non factory installations, radio, phone, alarm.
     
  4. Shamile

    Shamile F1 Veteran
    Silver Subscribed

    Dec 31, 2002
    6,563
    Lakeland FL
    Full Name:
    Shamile
    Daymn...that's a good trouble shooting method...I like that!

    Shamile

    Freeze....Miami Vice!

    Sent from my SM-G950U using Tapatalk
     
  5. Natkingcolebasket69

    Rossa Subscribed

    Agreed -my alarm used to drain the battery pretty bad, also a non functioning radar which I got rid of.


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  6. tf308

    tf308 Formula 3
    Silver Subscribed

    Dec 14, 2003
    1,122
    Virginia Beach
    Full Name:
    Tim
    Watch a new video from Scotty Kilmer on YouTube....he goes over how to do this. It’s a good skill to learn and use.


    Sent from my iPhone using FerrariChat
     

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