Follow your wires from alt' back toward firewall. You'll find a white plastic connector. This connector was added to the later models to make any engine plug and play on assembly line. Before this addition they were all different from bulkhead connector forward. Anyway...
Aftermarket offers reproduction of the engine harness from this connector forward.
I've seen this added white connector melted, wires shorted together a few times. Maybe better to have a fault/melt down there than at the bulkhead? I wont state a preference. I would definitely have a larger gauge BATT wire from alternator and route outside this connector. OEM was undersized here, wire and terminals in my opinion. Having factory terminals for senders, etc... is kind of nice though. They are all different so they don't interchange ( idiot proofed ).