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What could be causing this?
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Drove it in the garage, sat for about a week w/o starting, now no crank/no start.
I hate troubleshooting electrical !

Besides checking/cleaning grounds, any suggestions?
 

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Are you sure the negative clamp is attached to something that is actually grounded? Try some bare metal somewhere else.
 

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2001 Passat wagon; 2016 Golf Sportwagen
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I wonder if your starter security transponder and relay are causing issues. You can put a jumper wire across the security relay to verify.
 
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