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pajero wouldnt start and just clicks had aa out and they said it was the alternator but tried car over weekend and it started first time. tried this morning and just click had to have a jump start to get going.

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The problem is most likely the battery. It sounds as though it might have a dead cell, or have what is called a "surface charge". This describes exactly what you are talking about. Something you can do to test this at home is this:

Check the voltage of the battery while the vehicle is running with a multimeter. What you are looking for is if the battery loses voltage while the engine is running, it would be a sign the alternator is bad (ie: initial voltage reading is 12.45vdc and continues to drop). If, however, you get normal running voltage (13.1-14.5vdc), the problem lies with the battery.

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