could be a secondary tie in signal return or power out....
on 150s and e series it varies...usually gem related power ...powerstroke i had was black and a return for ipr. my diagram from helm said it was empty. so that is a mystery
i would ohm it out and identify it. i assume its on the explorer?
there are power and ground hardware scenario variance..
i would follow it out....probably something with ac or climate control or gem power for it.
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