Question about 1986 Jaguar XJ6

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Over charging battery, have ruined 2 batteries

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The problem is with your alternator, if you put a volt meter across the positive and negative terminals while the car is running you will see how much its putting out to your battery.

I hope this helps you out if so leave me some feed back.

Posted on Apr 05, 2011

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When the light comes on, stop driving. It could be the alternator burned out, but it could also be that the belt broke or came loose. So you risk not only ruining the battery, but also overheating and ruining the engine.
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Then put a voltmeter across the battery.
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Hi,I am Ron,Look at the alternator out put voltage,and have the battery load tested.Also check bad connection from battery to alternator(this is the large wire/cable).alternator turns the battery light on,why?You need to figure out witch one.A diode could be going out in the alternator,diodes change ac voltage to dc voltage ,that`s why the call it a alternator(alternating current)AC voltage means alternating current. If it goes unrepaired it can ruin battery,changing battery voltage from 12 volts dc to 12 volts ac.Also there is a built in voltage regulator that holds voltage down to about 14 volts charging while car is running.Voltage regulators can cut off charging completley or open wide allowing alternator to charge as much as 18 volts dc,ruining battery(boiling battery acid out of battery)and ruining alternator by burning fields and rectifiers out.So have it checked or do it your self.Auto parts stores can check alternator and battery.If I can be of more help,please ask.roniecon@gmail.com

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I would start with putting a battery charger on the battery over night. If the battery takes a charge, then you may have ruined the voltage regulator in your alternator and the alternator is not charging the battery.

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