Does your white nav light on the back work? If not, check DC switches in the engine compartment
if you have them...That got me one time

First place I went to, got lucky

Those switches get turned off when you monkey around in the bilge area
Like Docs said, ck connections at switch, clean and volt meter to see it you are getting pwr at at and trough switch.
Good luck tracking that little grimmlin...Let us know what you find, even if it make you look like a dummy...we have all been there
1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
New Edelbrock 1409 carbs (working like a charm)
Original Electronic Ignition, Blaster 2 coils, 90 deg plug wire universal kit cut to fit
Raw water system
Freshwater always
Located Pickwick Lake, TN,MS,AL
RETRO BOATS ARE COOL
If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.