"Brian" wrote in message
link.net...

I tracked it to the utility main where the power comes in from the
lines.

In my neck of the woods the power company uses aluminum lines from the pole
to the service panel. They use a special connector to connect their aluminum
lines to my copper lines and for some reason these connectors don't seem to
last very long. I've had to have them (the power co) replace mine twice in
about 10 years. RM~