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Jaguar Alternator related Questions

A device which converts mechanical energy into electrical energy in the form of alternating current is known as an alternator. In automobiles, the alternator, which is usually belt driven, runs at various RPM (Revolutions Per Minute) and helps to keep the battery charged. In other words, it supplies power to the electrical system whenever the engine is running. Owners of Jaguar cars may have experienced problems with their alternators from time to time. Given below are a few questions answered by the Experts on issues related to Jaguar alternators.

A new alternator bought for a 2004 Jaguar XJ8 is not charging the battery. What could the problem be?

There are a few things that one could check to diagnose the problem. The first is the power cable which connects the starter to the alternator as this is vulnerable to corrosion and can burn out. One should also voltage drop the charging system voltage at the alternator and the battery and note if there is a difference. Similarly, examine the entire circuit and test all the wiring to find the source of the problem.

Where is the alternator on a 1986 Jaguar XJ6 Vanden Plas located and how can it be removed and replaced?

The alternator is situated at the front of the engine towards the bottom left. In order to replace it, the battery would first need to be disconnected, after which the alternator adjuster link arm locknut needs to be loosened. The alternator then needs to be turned towards the engine and the drive belt disengaged from the pulley. Next, the bolt which holds the adjuster link and alternator together needs to be removed and the link should be swung away from the alternator. Once this is done, the alternator cables need to be disconnected and the alternator should be shifted away from the engine and the bolts removed. The alternator can then be removed from the engine compartment once it is eased away from the mounting bracket. Once a new alternator is fitted in place, the link arm adjuster nut needs to be adjusted for optimum belt tension.

What can I do if the battery of a Jaguar X Type 2.5 SE has gone dead?

Case details: Went dead with the voltage on idle at 15.3 volts. With the engine running and headlights on, it varies between 14.9 to 15 .1 volts. The alternator and battery was replaced over two years ago.

Typically, the Jaguar X type car battery needs to be charged at 14.5-15 volts. The alternator seems to be working alright but the battery may have a problem. Check the negative cable for corrosion, ensure that the small ground under the battery tray and the ground on top of the alternator bracket is tight and clear of any dirt and finally use an ammeter and check the draw on the battery. Finally, it is always recommended to use only Jaguar batteries as they are the most compatible.

Why is the new platinum series battery of my 1985 Jaguar XJ6 model reading high and sound like its boiling?

Case details: Battery kept draining and causing the car to die often. It suddenly climbed on the high side one day and blew all the lights, resulting in it being replaced. The alternator was checked and found to be alright. The new battery has the same problem.

There seems to be a problem with the voltage regulator and as most garages cannot check the regulator, it may not show up to be defective. In this situation, replacing the voltage regulator alone may not solve the problem. The entire alternator may need to be replaced.

The starter motor and the alternator was replaced on my Jaguar X-Type car 2.0d but the battery light still stays on. Any idea why?

Case details: After the starter was replaced, the warning lights came on and the battery drained. The alternator was then replaced but the battery light remains on.

If the charge is only about 12.5 volts from the alternator, it is possible that the new alternator may not be charging enough. The ideal output should be between 13.5 to 14.5 volts and if it is below this limit, the light will come on. In the event that the battery’s output is 12.5 volts and the alternator’s output is over 13.5 volts, the main connecting wire and starter motor connections need to be checked. Any damage to these could cause heightened resistance in the main positive lead which would result in the battery light coming on.

Is there a battery sense connection on the Denso Jaguar alternator?

Case details: The Jaguar part number is 1X43-10300-CC. There is a light, ignition and two other pins marked FR and C.

There needs to be four wires with the FR being pin 3 which is a varying voltage return signal from the alternator to the ECU. The C is pin 1 which is the control wire from the ECU to the alternator.

If you own a Jaguar and run into problems with its alternator, it can be both frustrating as well as time consuming to figure out what the problem is and how you can fix it. Instead, save both time and money by troubleshooting with an Expert immediately. Direct all your questions on Jaguar alternators to Experts who can offer valuable tips, insights and suggestions both quickly and at an affordable cost.
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