Re: How do I change the stearn light?
When you get it apart as per the previous directions hold it up to the light to see if this filament is toasted.
If not...it may not be the light bulb but the (plug-in) connection at the base. My stern light did not work at first and I thought it might be the bulb. On closer inspection on the connections (both male and female) I noticed they were a little 'green' and mildly corroded. I have a removeable stern light rather than a fixed one so my boat has a receptacle (with a cover) with the male elements buried deep down in there. It was a little time consuming cleaning them up but it paid off.
I cleaned them both up with fine grit sand paper and voila'...stern light magnifique. It worked...it was the connection not the bulb.
So if it ain't the bulb...check it out.
Good luck