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2004 twinport 1.4 exclusive, when I rev the engine from idling with the headlamps on the dashboard illumination gets brighter relative to the revs, also when I use my indicators the dashboard gets brighter and duller in time with the flashes. Battery also runs down flat if left for a week without use. Brand new battery has been fitted, I'm thinking bad earth connection, any ideas?
 

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alternator not charging.
 

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not if its a partial charge fault
 

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Use a multimeter to test voltage on battery - around 12v is good
Then start the engine and do the same - around 14v is good

If its less than 14v, alternator isn't giving enough voltage.
Unfortuanatly, you need a pretty depict meter to set the current the alternator is giving out, but this is a good starting point
 
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