disconnect one lead from battery and connect voltmeter between the battery and lead.Switch meter to amps and take note of reading-should be minimal,anything above 0.5 of an amp should be investigated,something is switched on and draining battery,have had faulty new batteries before,maybe worth trying a discharge test on the battery and also check that the alternator is charging,should get around 14volts with engine running.
wickham
April 2010
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