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post #4 of (permalink) Old 9th November 2006
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Are you sure its your altenator? and not just ab ad earth?

If you have access to a voltmeter, try this.

Put the voltmeter across the battery terminals, obviously + to + and - to -!

It should read around 12.6volts if the battery is good. If its lower it should still be okay to test but it needs to be at least 70% charged. (75% charged would shouw about 12.4v)

Second test is to do the same but with the engine running, you should be looking at the voltage rising from 12.5 to around the 14v mark, thats on a warm day so if its a little less it should be fine if its alot less than that then theres a problem.

If the battery voltage rises to more than 12.6v then it is charging but not fully (this has happened to me) and its more than likely a bad earth, corrosion is the usual culprit!

These checks are pretty simple and only require some DIY knowledge but if you can find a bad earth somewhere, clean it, and find your battery is charging you just saved yourself some money like i did.

also, forgot this! (D'oh!) check your altenator belt is intact and not slack!


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Last edited by GeordieClio; 9th November 2006 at 09:47 PM. Reason: Forgot to add another test!
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