Wow, I see now. Do you happen to have the owners manual that came with the TM? Mine had a wiring diagram and for the exterior lights, it states "grounded to exterior skin". If your's has the same, then possibly someone else has modified the wiring.
Sounds like you are going to have to trace through all those splices and the junction box, etc. Good Luck. If you run into more problems, there are plenty of experts on here.
Check for continuity between the good ground points you found and the ground wiring of the lights, starting at the ground terminal of the socket. One trick I've used is to pierce the insulation (carefully, watch fingers) with a small straight pin, to check continuity at various points, before and after each splice, etc. to isolate where the bad connection is.
I've used those types of splices before, the ones you crimp through the insulation, and have always had trouble with them working loose or oxidation inside, etc.
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