Originally Posted by twistedtree
Sounds like a short in one of the seatalk attached devices, or the cabling itself. Try disconnecting devices from seatalk one at a time until you find the culprit.
I agree with TT and was going to suggest the same thing. The issue is indicating a short. Be aware that sometimes the SeaTalk backbone has more than one power supply connection based on how long your backbone is.
A wire may have come loose during the bad weather and shorting out....