Battery Light Megged 197

Hi Guys

My megged clio battery light comes on usually after 10 mins of driving and I am led to believe it is due to the megane alternator being used and the pulley is a different size so charges quicker?

Is the 197 alternator a straight forward swap?
 
ha I might live with the battery light until the garage warms up in the new year!

Doesn't affect it in anyway so not overly bothered, but I'd like to sort it
 
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