The lights are not that bright else they would ruin your night vision at sea.
Have you tried it in the dark?
It may be bedded in some sealant and will require a little prying.
If you remove it you can hold the wires across a 12V source to see if it lights as it may not be getting power.
1997 2400 SCR
5.7 Vortec / Bravo 2