Question about 1999 Jaguar XK8

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My 99 Jag xj8 turns over slow with a battery thats ok. like it is dragging, the car has been in the garage for months now. only has 58000 miles on it.

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Ok, just because the battery is cranking over, does not mean that the cell inside the battery are not weak. they will always take a charge. but as to how long they will keep that charge is the problem. all 12v systems are as follows so check yours.

all should have no more than 14.5v during a charge(engine running) anymore it will fry not only the battery, but other componets as well.

all should have no less than 12v with the engine off, and a load test of no more than 15sec, and a drop of 10v or higher should be present.

with a good battery and alt, there should be a drop in voltage no less than 8v during a start crank, and after it starts it should rapidly return to a 12.5v to 14.5v charge. I suggest to have the battery and altinator tested for a load, and cell state.

Posted on Jan 03, 2011

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Try some jump leads ,good ones not chinese junk things in case battery is low ,check the earth strap from engine to chassis

Posted on Jan 03, 2011

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IF you say the battery is good HOW do you know have you had it checked by a volt amp tester ? if it is good then you need to check that the battery ground to engine is good and the battery ground to body is good also check the draw of the starter

Posted on Jan 03, 2011

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