New Battery Didn't Help
#1
New Battery Didn't Help
I got a new battery which when fully charged stopped the Poor Performance warning. However; something is draining the battery and after a week of not starting the car or driving it when I start it I get the warning again. Any ideas on what could be draining the battery? 1997 XK8.
#2
First check that there is not a light on as that is the most common issue.
Are you leaving the key in the ignition? That keeps the security control module powered. Likewise, if the key slot cover does not close over the key slot with the key removed that has the same affect.
Beyond that pulling the negative battery cable and measuring current drain is next. More than 30ma after 30 minutes then you have to start pulling fuses to locate the offending circuit. Remember to take the bulb out of the trunk light when you start on that fuse box. Negative or positive doesn't matter. Just that the negative is easier to get to.
Are you leaving the key in the ignition? That keeps the security control module powered. Likewise, if the key slot cover does not close over the key slot with the key removed that has the same affect.
Beyond that pulling the negative battery cable and measuring current drain is next. More than 30ma after 30 minutes then you have to start pulling fuses to locate the offending circuit. Remember to take the bulb out of the trunk light when you start on that fuse box. Negative or positive doesn't matter. Just that the negative is easier to get to.
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Guy-Pierre Boucher
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
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09-16-2015 05:55 PM
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