2001 Sea Ray 480 MY

The blowers in the forward head, aft head and gally no longer work.
I can't find where they are so I can replace them. Any suggestions

Have you checked the electrical panel to make sure they are on.

There could be one or two blowers on your boat. Galley share blower with one of the heads. If both failed at same time then I suspect electrical problem, not blower failure. Check blower breaker/s first and ground going to blowers. If you need to locate blowers they usually hidden behind cabinets or refrigerator. Take a look on boat hull and locate small grilles for fan exhaust. That would approximate location of exhaust fans. Sometimes they mounted directly to hull, sometimes are in-line.