Just carried out light check on my 2005 db9 and it appears that the n/s rear side lamp and n/s front dip beam are dimmer than the o/s, brake lights same intensity, indicators ok, rear fogs ok, battery is fully charged, everything else ok, ideas anybody??
You could try doubling up the earth temporarily to see if it's a bad earth problem. Identify the earth cable and run a wire straigh to the negative terminal to test.