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Instrument cluster fault draining battery

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My 1998 Boxster is experiencing a dead battery problem. After leaving the car overnight there is no juicer to power any part of the car. Can only be started using an outside battery. I took the car to a local Porsche specialist who, by process of elimination, determined that the problem lay in a fault in the instrument cluster which is drawing power even thought the ignition is off and key removed. Among things checked and eliminated as a cause were the ignition switch and the alternator. Estimated cost to replace cluster plus diagnosis is $2800. Is this common , rare, or unheard of? Are there any other possible causes which should be investigated?

Thanks for any ideas or guidance


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The dealer can check with the PIWIS tester, in the menu "wake up guardian", which control box refuse to get a sleep or wake up after a well defined time.

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My 98 drains in about 5 days, from brand new battery install, The Horn is one place it has been draining, removed the fuse but there is still a drain, I think it has something to do with the alarm as the alarm horn has been disconected when I bought it ,Please keep us up to date as to what happens as the drain fried my alternator already. I had a 5 and a 3 BMW that had the boot light that stayed on after it was shut (Sometimes) and that drained the batt also.

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