neutral saftey switch could be somewhere to start.

When I turn the key and this has only happened a few times, but I hear a click, but the starter does not engage unless I turn the ignition back off then on then it turns over fine.

IT is a click like a relay engaging, but the starter just not getting a signal to spin the engine over.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon