Question about 1987 Jaguar XJ6

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Alternator no-charge situation

My idiot light is on even when the car isn't, when the ignition is turned on, the light dims, but doesn't go all the way off, and the alternator is NOT charging. Any ideas?

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Hi,

The idiot light is just warning you. A bright/normal light indicates charging system is not working at all like when engine is off or fanbelt is cut. On the otherhand, a dim idiot light indicates that the output of the charging system is below expected value, it is not enough to charge fully the battery. This could either be the regulator or the alternator. Often the regulator is replaced with an entire sub-assembly and no repairs. The alternator could either be any of the diodes (very often) or the windings (seldom). A fault on any of the aforementioned could and would cause the dim warning light.


Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jun 13, 2008

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