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Alternator problems with Ford Focus

I have a Ford Focus 1.6 petrol (2001) and have recently been experiencing starting problems with it. I assumed it was starter motor, but now I'm not so sure as it started first time the following day, but when I put my lights on it cut out.

I noticed the alternator was hot and put a tester on the battery to check, but it did not indicate that the alternator was faulty. I buy a new alternator does the diode come with it? I have been told this could be causing the fault too.

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Usually the alternator diodes are on the back of the exchange alternator so come part and parcel with it. Not worth messing around trying to buy them separately.
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Good to drive. Roomy cabin well thought through. Massive choice of used Focus at sensible prices. Better car than a similar aged Volkswagen Golf.
 

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