Question about Jaguar XJ8

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2000 jaguar xj8. 4.0 liter. put in a second reman. alternator, still the battery light came on. checked with a dvom meter, registered close to 8 volts. battery was replaced 3 weeks ago

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  • edward lai Mar 15, 2011

    this is the 2nd reman. alternator we r putting in. the battery light stays on at idle as well as high rpm. would a bad ignition switch causes this?

  • edward lai Mar 16, 2011

    thanks

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  • Jaguar Master
  • 17,970 Answers

It is probably your alternator and may be showing voltage but not enough amperage. Have it tested while the light is on and a good alternator will put out 1/3 of total rating. So if you have 120AMP alternator it should show 30-40AMP load with all lights on and blower motor on and engine at 2,000 RPM's. Make sure if it is an alternator issue you have the new one tested before installing.

It may be that you have some corrosion on the plug for the alternator. One of the leads affects the current going to the field, which then affects the output voltage of the alternator. You get a high resistance connection in this lead, it can cause the alternator to act funny. You can try spraying the plug to the alternator with some contact cleaner and see if that helps.

Does the battery light come on at specific times? ie, high RPM, whenever the dash fan is turned on high with the car at idle, etc... A common failure mode for this sort of problem is if you are getting the light with high RPMs (over 3,000), then odds are your alternator is on its way out. If you are getting the light when you turn on the dash fan (large electrical load), then odds are you either have a bad alternator or the wire feeding the field of the alternator is having issues.

Keep us updated.

Posted on Mar 15, 2011

  • ZJ Limited
    ZJ Limited Mar 16, 2011

    Ignition switch? Isn't possible; check belt tensioner.

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