[rgunlock]

Well, I think I found the culprit. I'd installed a battery disconnect from AAW on the positive battery cable. If I bypassed it, I had nothing on the test light. Reconnect it and remove the switch for the disconnect - test light on. Unmount it from my fender but leave the positive battery cables connected and nothing on the test light. Apparently, this disconnect was grounding through where it mounted on the fender. I'd have assumed it would have been isolated internally from doing that.

So, I've removed the disconnect and temporarily connected both sections of the positive battery cable. I'll add fuses, etc. back one at a time checking with the test light since I've gone this far. Thanks for taking the time to make suggestions.