Question about 1998 Jaguar XJ8L

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Battery drain on a 1999 Jaguar XJ8

I have a problem with my battery draining rapidly on my 1999 Jaguar XJ8. The battery test good as well as the alternator. I took the car to one of those auto part stores and they ran diagnostics on the car. While the engine is running, the current draw on the battery is greater than the alternator can generate. Any idea where I should start checking? Is there a common grounding problem with the car?

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I seen this same problem with a Toyota Tacoma.the starter was drawing the battery down all the time .we replaced the starter with no more trouble.

Posted on Jun 18, 2009


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My 94 jaguar xj6 battery drains even if the car is turned off what could be causing this

I have less than fond memories of tracing electrical troubles in a Jaguar (though much older than yours). Here's the basic process you need to follow:
1. Pull all the fuses. Does the battery drain overnight?
If yes, then a circuit that is not fuse protected is the problem. Start with starter/solenoid, etc. Disconnect each thing and test with meter.
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Yeah, It's a pain, and may take days, but you can find it.

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99 toyota corolla drains battery. After parking the car for a few days, it won't start...just a clicking noise. I thought my battery was bad and got it tested at autozone...the guys told me it was not...

You may have a parasitic drain on the battery.
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Hook up an Amp meter in series with the battery and see what the current draw is. If it is more than 250 milliamps you have a parasitic drain.

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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.

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.

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Jaguar xj8 battery battery not charging

If battery is good and has past a load test, then with car running put a volt meter on the battery terminals, 1 on positive and 1 on negative, they should show approx. 14.5 volts. dc if alternator bad it will just show battery voltage or 12 volts dc.

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the starter could be draining it

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Fault code V01774 on a 1999 Jaguar xj8L

Hi Darrin

Try disconnecting the battery + & - terminals.

Turn the ignition key several times to erase the computers memory.

Reconect the battery + terminal then - and start the car.

Your fault code, will hopefully not return.

Good Luck !


Jan 15, 2009 | 2001 Jaguar XJ8

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