Ignition warning light .....query?

Hi, Car sparks out there.

I've just had an alternator replaced (new) after the old one died.

...strange things happening with the ignition light though. When switching on before turning the engine over (Fiesta diesel LX) there's no light illuminated now, however, it flickers slightly as the engine turns before firing then it's off as usual when it starts.

Is there a short (?) somewhere or should I be concerned about anything like battery discharge or nothing getting back to the battery chargewise?

perplexed.

thanks in anticipation

Chris