Electrical problem

Hi all,

Wonder if anyone has had this problem with their car and any possible solutions:-

I have a 2000 micra K11 and have recently developed an electrical problem.

When the lights are on the dash board/instrument lights occasionally dim slightly along with the headlights and the battery warning light comes on. I have noticed that if I tap the square digital odometer display below the speedo all lights return to usual brightness.

This has only recently started to happen and it only lasted for a minute or so, however tonight the battery warning light and instrument lights have remained dim which surely puts me in danger of a flat battery.

Where is the problem likely to lie? Please dont tell me it's a dash out joby!
:(
Thanks for any assistance,
Steve

PS- My battery is the original but has never given me any trouble - even when left standing for a few weeks.
 
Further to my original post. I believe the problem maybe the alternater not putting out enough power.
It looks like it is only 2 bolts fixing it to the block, 2 electrical connections and the belt. Is replacing the alternater this simple? any advice appreciated.
 
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