Intermittent total loss of electrical

Thanks. I've checked all underhood cables and connections. Everything seems sound and is tight. I haven't as of yet been able to find anything that looks hacked or modded, other than the bypass of the bulkhead connector of the ammeter feed. The pins were removed and a solid wire run through the port.
I have even seen 1 gauge wire that was cracked/corroded inside....copper doesn't age all that well if any moisture is involved.