So I found the culprit--a worn/damaged spade terminal and wire connection. I pulled the spade terminal from the connector and found this...
So Jeff, if you find that harness, let me know. Worse case scenario I will splice a trailer connector into the end of the intermediate harness and the taillight harness. I didn't really want to do that and act like a previous owner
, but it will/should work just as well.
Thanks.