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Those connector terminals are not up to task, as seen in the discoloration of the connector plastic and the start of plastic melting.
So some redesign with some relays in the high current paths may help.
The signal paths to activate relays can remain as desired.
Examples would be a headlight relay is never fitted at the back of car.
Fuel pump relay would be between battery positive and the pumps, keeping the high current paths as short as possible.
Gary
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