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2005 mk1 Touareg V10 tdi in black
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Hi Laurie,

Corroded wiring harness splices under the seats is a common cause of your symptoms. The splices are crimped together at the factory and corrode and/or come apart over tine causing intermittent electrical issues and battery drain.

Am in the middle of this repair on my T1 as we speak so will have a full write up in a week or so.
Below is a video of a Porsche Technician doing the repair on a Cayenne:


 
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