Gordy, check that Special Relay Box has continuity to chassis ground first, then between A5-15 Terminal and the ground stud in Special Relay Box for continuity.
If you have continuity, then check continuity from A5-2 to P9D (plug which mates with/to J9 Receptacle on A11), if you have continuity then either K5 is bad or A5 has a bad solder connection / burnt trace.
I believe you showed a picture of A5 earlier and it had no burn marks.
Peter