Thanks for your help Arthur Dalton,

Your previous posts have been Most Helpful. I'll take another look at the fuse and x27 in a day or so. Just covered up right now at work.

This white E320 with 100k came from a salt-air environment east coast Florida island. I've had previous problems keeping the A/C circuit working at the fuse box. I will be renewing fuses and plan to coat fuse contacts with a dissimilar metal electrical contact product used by my home electrical contractor.
Ed in Va.