Any chassis earth point should be suitable. Paint can affect the connection, so an exposed chassis bolt or bracket etc would be preferable. The most important thing to remember with CTEK or similar chargers is to make sure you have the charger connected to the vehicle before you switch on the power.
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1996 850 T5 - Sold
2003 S40 1.9d - Sold
2004 S60 D5
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