No announcement yet.

Battery going dead

  • Filter
  • Time
  • Show
Clear All
new posts

  • Battery going dead

    The battery goes dead after a few days of not driving the car. I do not have any interior lights left on or any thing other than a stock radio. Anybody have any suggestions as to where the drian is coming from? Someone mentioned at one time about the trunk light possibly staying on all the time?????
    "Racing is like life, what happens before or after is just waiting." - Steve McQueen (Le Mans)

  • #2
    Im not sure if the trunk gets offset or the mechanism itself fails, but its a very common problem. Climb into your trunk and have someone close it and if the light stays on, thats your problem.


    • #3
      if it is not a drain item it could be due to the age/wear of the battery (assuming it is more than a few years old).

      I think there is always a very small drain from car alarm etc.

      Mine acted like yours last year and replacing the 5 year old battery with a new Interstate batt was the fix in my case.


      • #4
        I have the same problem. Is there a general procedure to test where the drain is coming from? I tried putting a voltmeter on the fuses when the ignition was off and about half were hot and half were off...
        "It is needless to say that self-propelling vehicles, like other machines, will never do as much for one who does not understand them as for one who does."


        • #5
          Trunk light goes off when the trunk is closed
          "Racing is like life, what happens before or after is just waiting." - Steve McQueen (Le Mans)


          • #6
            Unhook the battery cable, and hook up a voltmeter to measure the amperage draw when the car is off and @ rest. Then start unplugging fuses one circuit at a time to pinpoint what circuit has draw. Once you identify the circuit, then start eliminating componets on that circuit. Some things will always draw a little power, like the computer, clock, etc.
            What??? an E30 M3 for sale??? I'll be right there!!!