How can I fix Renault Laguna RT 1800?

I have a 1987 Renault Laguna RT. It keeps draining power from the battery, no matter how much or often I charge it. I bought a new battery a few weeks ago, alternator was checked and reported to be ok but the problem persists. Could it be an electrical fault/short? If so, how can I detect it?
Any suggestion received with thanks.
Jason, February 2005


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Sorry, it's a 1997 Laguna. I'm as good at typing as I am at fixing cars!!!

Jason, February 2005
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