Question about 1997 Jaguar XJ6

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The battery light came on and the battery was replaced. The alternator was also checked and determined to be ok. Now the battery light comes on and the slternator shows as charging at about 14-15 Volts any comments

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Check the battery with a volt meter. Place the probes from the meter inverted which means positive from the meter to negative on the battery and negative from the meter to the positive one the battery. MAKE SURE YOU STE THE METER TO THE DC & NOT TO THE AC MODE BEFORE YOU TURN THE METER ON. Now start the engine and see if a reading shows of 14 - 15 volts. If so the diode is bad in the altenator. The diode suppose to keep the current running only one way. If the current is running both directions the altenator does not charge the battery completely and the battery light will come on this way also

Posted on Jan 31, 2010

Testimonial: "I thought it might be a diode but didn't know howw to chek it. Thakns for the info and I'll check it later today."

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For maximum peace of mind, I would have the alternator replaced if you experience any starting problems attributable to a weak or undercharged battery.

14.45 volts doesn't sound bad to me, for an initial voltage, but there may be a problem with the alternator (like a bad diode trio) , which controls the battery charge light pretty directly.

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