Is it the battery or something more major? - MINI Cooper Forum

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post #1 of 2 (permalink) Old Mar 8th, 2014, 10:58 PM Thread Starter
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Is it the battery or something more major?

Hi guys

Not sure if this is the right place to ask this question. Please move the thread if need to.

Just a quick background info on my car:

2004 Mini Cooper
just over 100,000km+
approx 3 year old battery
installed warm white light bulbs for head lights, led light bulbs for parking lights
recently upgraded radio head unit with BT
only gets driven 3-4 times a week, short distance to work (45km per return trip)

After the radio HU upgrade which I did myself, I noticed my car doesn't start in the morning on 1st attempt. But it starts smoothly on the 2nd attempt.

This only happens the first thing in the morning, meaning when I leave work, it'll start straight away.

However, late last week it began to fail to start until 2nd attempt when I leave work too. So, I'm thinking maybe the battery needs replacing. Any other thought?

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post #2 of 2 (permalink) Old Today, 12:00 PM
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sounds like you have parasitic draw. there is a short somewhere in the system. it may be in the stereo wiring since you most recently upgraded. You can use an amp meter to check. disconnect the neg battery cable, make sure the car is off and doors are closed and there are no lights on.connect a amp meter at 10 amps between the battery terminal and battery cable, the meter may show > .1 amps. Then pull the fuse that the stereo is on to see if there is any draw and the meter should go to 0 it that is the problem connection. there should only be .005 amp which will show up on a 10 amp mutimeter as 0. If there is still >.005 there may be more than on circuit causing the draw. Look on youtube for parasitic draw or finding a short.

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