The problem is looking more & more like the OPC controller is the problem. Just for reference, the OPC fuse is good. Plugs connected well & everything is good visually. Was kind of suspecting worn, chaffed or otherwise damaged wires. Maybe even a mouse nest or related damage. But no such luck for simple fix so far.
Going to do a little more digging in WSM to see how I can better test. Thanks to everyone. Ideas still welcome.
Going to do a little more digging in WSM to see how I can better test. Thanks to everyone. Ideas still welcome.