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One more possibility -- I only mention this because you wrote that you recently replaced your alternator.
There is a cable bundle that runs from behind the alternator and then snakes under the alternator mount -- it has the very heavy, main output cable (B+), and two smaller gauge cables (oil pressoswitch and alternator field wires), as well as the heavy ground.
Sometimes, when a new alternator is installed and rotated to fit the belts on the pulley, if that bundle isn't positioned just right, it gets pinched or crushed between the alternator and its mount, and (depending on which wires in the bundle are damaged) this could lead to a short. There's a possibility that a slight contact across the wires, resulting in a short, might be affected by the temperature of the engine compartment, or that even vibration (following a long drive) could affect their contact and therefore the flow of current through this short.
I know this is a long shot, but if you can't find anything else, consider this. By the way, a short such as this, depending on which wires in the bundle are involved, could burn through the oil pressoswitch and cause an oil leak (under pressure), and can even start a small fire burning the insulation (and using the typical oil sludge coating the area as fuel).
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