Trev Latter
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- 1,213
If you've already changed the battery, chances are that it is the starter if you've already ruled out bad connections on the battery and earth leads to the engine. A poor engine earth could cause the starter to not engage and turn the engine over as you've described. Easy way to check is to connect a heavy duty jump lead to the engine block and directly to the battery negative terminal. If it all fires up as it should, you'll at least know where to start looking. Have you checked the battery voltage whilst the engine is cranking? (or at least trying to). I've known Optima batteries to suddenly fail without warning before, so I wouldn't just assume it's ok without making sure first.