My car ('92 300CE) with 187,000 miles refuses to start sometimes. Hot or cold it just doesn't want to turn over. All I hear is a "clicking" sound when key is turned. It does it intermittently not all the time.

Where would one start to look. It has new plug wires, rotor, cap, plugs, filters, etc...

Any ideas would be helpful.

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Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta