First off I would check all your battery leads and earth leads for loose or bad connections. As a matter of course I would take the battery leads off and brighten up the terminals and clamps with some emery paper.
Then if you have a multimeter you can check the charging voltage at the battery.
Also check the battery is good as when they are near death they can produce some weird effects.
That done then I would disconnect the battery leads (both to be certain and at the very least the negative lead) and then disconnect the alternator leads and remove that cover so you can get a part number off the old regulator/brush holder. Unless you are 100% certain of the alternator you have I wouldn't rely on an online parts search without the original part numbers off the alternator/regulator.
It may be possible to do the work on the alternator without removing it. I don't know how much room there is to get access.
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'04 V40 1.9D
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