2011 Takuya. Had battery replaced last weekend by breakdown service as the old one died. Since replacement every time I turn my lights on, the dash lights dim so I almost cant see them. I've twisted the dimmer switch - doesn't do anything although I can hear the beeping.

Took to my mechanic who tested the new battery and the alternator - no issues. Could a dash bulb have blown or something? Worried that something is draining the power when the lights turn on.