Where can I find these Female connectors?

Jim Kueneman said

Show me an original that did not have that plastic either turned black near the main power connection or actually melted.

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I could....but it is not the norm for sure. Same goes for the bulkhead connector. This is why new cars have a pile of relays under the hood. No need to run any big power into the car this way. Cheaper to install relays than it is to install heavy gauge wire to handle it.