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Mechanic help


rimfire4969
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Once again I am asking the PW great and good for a bit of advise.

 

My eldest Daughter is learning to drive and she saved some money and we helped her out to buy her first car a Nissan Micra, its a great little car and so easy to park compared to my 90 or the wifes A4.

 

The one problem with the car is the battery loses charge very quickly. I got a new battery as the old one was not in great shape but the problem still continues. New battery on driven for about 40 mins 5 days ago no problem, went to start it this morning and nothing not even enough power for the central locking to work. Jumped it off my landy no problem. A multimeter across the battery with it running gives about 13.6 volts so I guess alternator is ok? So I think something is draining the battery when its sat there. I am guessing the alarm. How the heck do I check if this is the case?

Edited to give correct voltage. Thanks guys.

Edited by rimfire4969
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So taking off the negative cable to the battery and putting the meter across from the battery to the battery terminal I am getting about 3.6amps. This is with the car locked and all doors shut. So to my thinking something is drawing a hell of a lot of power when it should not be. Once I find a couple of clamps to attach the multimeter wires I will start pulling fuses to see where the power is going.

Edited by rimfire4969
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So taking off the negative cable to the battery and putting the meter across from the battery to the battery terminal I am getting about 3.6amps. This is with the car locked and all doors shut. So to my thinking something is drawing a hell of a lot of power when it should not be. Once I find a couple of clamps to attach the multimeter wires I will start pulling fuses to see where the power is going.

 

Thats a hell of a discharge !

We work to a tollerance of 0.05A, (50 milliamps).

 

Pulling fuses and relays next is the correct way forward. :good:

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Sounds like alternator not turning off and leaving open circuit, common fault its the built in regulator that causes it, it can be repaired or exchange unit fitted. :yes:

That's where I would look :good: Possibly a diode gone in the alternator. Just pull the plug out the back and see if the current drain stops.

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