[C320-list] Strange "thunk" electrical noise
Bill Culbertson
billculb_a2 at yahoo.com
Thu Dec 27 16:52:39 PST 2007
I finally made the drive down to the marina yesterday to check on Harmony. We'd had a big rain a week back which melted all of the snow and yesterday was about 40dF and sunny so it was quite pleasant. All was well aboard and it was comfy under her winter cover. The batteries didn't need as much charging as they usually do.
Then as I was closing up shop I shut off the main battery switch and remembered something so turned it back on. There was a distinct "thunk" sound. Strange. I repeated off, on and each time there was a thunk. Location was ambigous but seemed starboard about deck height. I have a Link20 monitor so after I turned off all cabin lights and everything else electrical, I could confirm that there was nothing drawing any current. In that state, I could switch it off and on without the thunk. But turn on one cabin light and repeat and "thunk". Again via Link20 I confirmed that only one cabin light's worth of curren was flowing when I turned the switch on and heard the thunk. To be certain, I toggled the windless breaker by the battery switch (Harmony is #859 and has the switch on the starboard panel) to be certain it was disengaged.
I also pulled the starboard cushions and boards to better localize the sound and to inspect everything in that area. The sound is not from the settee area and I saw nothing unusual down there.
This baffles me and worries me. I didn't smell anything. I stuck around for quite a while after disengaging everything to see if there was any electrical smell or anything to raise more fire worry.
Anyone have ideas?
-bill
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