ColonyCove
Senior Member
- Joined
- Nov 24, 2010
- Messages
- 146
- Vessel Name
- The Blue Comet
- Vessel Make
- Nordic Tugs/ NT32
I need some help from trawler detectives on this. Boat is an 04 Mainship model 400. Went aboard today for a general check. Electrical humming sound heard, coming from the area behind the guest room closet. Shutting off the DC Main breaker did not stop it. Shutting off the 120v shorepower feed breaker did not stop it. Finally stopped when the aft shorepower breaker was shut off. So... It is 120v and electrically hot more than 1/2 way up the boat's port side without even cutting in shorepower feed. I removed a portion of the back wall panel in the closet to get at the sound. The object within is 15 1/2 in. long, 12 1/2 in. wide and 10 1/2 in. high, with a 1 1/4 in. spacer to keep it elevated from its horizontal shelf, white with no markings on any visible surface. I've had this boat for four years and never heard the hum before. This could well be chalked up to the fact that I am obtuse, but in my defense this was a particularly quiet and gentle day on the water. Believing that a prudent skipper knows his boats systems, I ask for your input on this. What is it?