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Q:

alternator on 2002 Jaguar X-Type

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The + contact on the battery heats up after 15 minutes of engine running. Cleaned contacts on stare and battery. Also cooling fans run for 15 minutes after engine is off. I used a volt meter and noticed the alternator is 14.4 volts no matter what options are turned on or off
(1) Answer
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The alternator should charge at 14.4 to 14.7 volts that is normal. Connections should not get "hot". Is your car a 2.5 or 3.0L?
Ensure the coolant fans staying on is not due to coolant loss, leaking coolant expansion tanks were a problem. Cooling fan modules failed but normally caused the cooling fans not to operate at all.