65amp wiring/trouble shooting

Okay I have now got some more things figured out. I have removed the instrument cluster completely to check if something actually burnt behind the cluster and to check the cluster itself. The only cable that melted is the red ammeter cable we've already talked about earlier in this thread. Everything else in the dash looks fine. I've also checked the bulkhead connector which also looks fine. What does not look fine is the ammeter. There are two bolts that hold the ammeter in place. Between the cluster and the ammeter itself is a piece of - acrylic plastic/glass I guess? It also melted away which caused the ammeter to be loose. I have no idea why they would build it like that. The cluster itself got fire marks. Due to the burnt ammeter I need a replacement I guess.
I've also made some videos to show how loose the bolts were due to the melted plastic but I can't upload them here...


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