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Alternator problem > both batteries dead?


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Hello all,

My vehicle (110 Td5, 2002) had work done on the alternator which the dealer claimed was a faulty lug. They replaced it and I drove 200km without a problem. However I didn't use the vehicle for 2 days and had to jump start it. I have 2 x deep cell batteries on a dual system, I charged for 24 hrs but still no life. Engine turns over but won't start. One battery is showing red on the hydrometer but reads 13.3V on the multimeter test, the other shows green but 12.4V only

Could this damage to the alternator have ruined both batteries?

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Also the ECU needs a decent battery to start otherwise it won't open the injectors properly... hence why you may have trouble starting it.

Take it back to whoever did the work and get them to check it - it should be warranted for 12months should it not?

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12.3 - 12.4v from a 12v car battery means its flat. it should be nearer 12.8v for a healthy battery and as it gets more discharged it will drop to 12.3-4 ish

and your never going to charge it with 13.3v. You need 13.8 to 14.4v to charge it (most alternators will put out around 14v)

What exactly is providing the 13.3v feed? A mains battery charger? It might be faulty if its only putting out 13.3v...

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12.3 - 12.4v from a 12v car battery means its flat. it should be nearer 12.8v for a healthy battery and as it gets more discharged it will drop to 12.3-4 ish

and your never going to charge it with 13.3v. You need 13.8 to 14.4v to charge it (most alternators will put out around 14v)

What exactly is providing the 13.3v feed? A mains battery charger? It might be faulty if its only putting out 13.3v...

Yes the 13.3V was with a mains charger... won't get higher than 13.3V. If both batteries are dead, how could this have happened?

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i would imagine that something has drained them, either the alternator isnt charging them or something was left on overnight or whatever

the point being you cant charge them with 13.3v and could actually damage the batteries by trying to.

I would think there is something up with the mains charger if thats all its giving out... Can you try borrowing another one?

once you've got both batteries charged properly, i'd start the landrover and check the alternators charging voltage is 13.8-14.2v

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