Lights dim/flash under revvs

[gsr-mat]

Have a slight problem I have been noticing with my cc gsr, when at high revs and I clutch in to change gear the headlights seem to dim and to some extent flash for a slight second. The battery on my car is around 12 months old (or so I have been told) so I was thinking potential earthing problem or faulty alternator?? I have never had a problem starting the car it always cranks over first shot. Any help or ideas would be greatly appreciated.
Cheers
Mat

 

[p3akin]

my interior light used to dim abit when my radiator fan went on.. or when i turned on/off my headlights.. light has since busted..

could that be battery as well...?

 

[CLuTZ]

Check all your earths

 

[EVO-00X]

Yeah any of the following basically - Earths, low charged battery, alternator on its way out causing the battery not to be fully charged. Run a multi-meter on the bastard and see what its charging at.