electrical problem

I have a 1.8 W plate focus. Intermitantly, the whole electrical system appears to cut out - lights radio etc. all go off for about a second and then all restore. When it restores, the dials - spedo, rev counter
all go hard over before returning to their normal positions. The trip counter resets and the radio requests it's security code. Any clues please?
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loose battery terminal, or fuse fault (loose)
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Worrying- its got to be the feed to the main bus bar i.e. the constant live supply- so batery terminal, one of the main 60 amp fuses in the engine fuse box.
Tim..
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If it's a 2000 US model, this is probably considered normal behavior! jor

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