IIRC, if the battery light on the dash has blown, this can affect the charging of the battery as it relies on the bulb to complete the circuit.
Also, on older Vauxhalls, there was a braded earth strap between the engine and one of the bolts on the alternator. The lug that attached to the bolt could break, thus leaving the alternator with no earth connection. This can also stop the dash light from working. Might be worth looking to see if any wires have fallen off.
Edited by Dynamic Dave on 06/02/2008 at 13:44
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