Join Date: Aug 2006
Location: Arlington, VA
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Re: Slapping wires in mast.
I had this problem for years. It's very annoying, indeed.
Unfortunately, there's no good way to stop it, at least none which won't have problems later on.
The usual "fixes" are: foam, wire ties at various intervals, arranged in triangular form, etc., etc.
The only real way to fix it, however, is a proper conduit. And, this can normally only be done with the mast down.
A PVC conduit for the mast wires is inserted the length of the mast, and secured to the mast with aluminum rivets.
Yes, most manufacturers have some sort of conduit installed when building the boat, but you may have the same problem I did: a previous owner adding internal wires without passing them thru the existing conduit.