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post #6 of (permalink) Old 8th December 2008
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If the starter fails to spin the engine over, then maybe you need to start looking a bit further up the chain of events to start the engine.

One of the old favourites is oxidation on the battery terminals, leads or earth connections to the bodywork for both the battery and engine.

All these connections carry a high current when the starter is used. Any oxidation can lead to a high resistance connection that can't deliver enough current to spin the starter, or, if it does spin, the voltage drop can be too much for the rest of the electrics.

So even if the engine turns over, the rest of the system doesn't get enough 'juice' to operate, so it can't fire the plugs, so the engine doesn't start.

The voltage across the battery, even when cranking the engine, would look good, but there would be little left to run the systems connected 'downstream' of the faulty connection.

In a similar vein, a battery nearing the end of it's life can fail to deliver the goods, leading to similar symptoms. In this case the voltage across the battery would drop significantly as the starter cranks the engine over.
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