What Is The Wire?

I had my motor out for rebuild for the past 5 months and i have this one pesky wire I can't figure? It's coming out firewall behind/lower of the brake booster. It looks to be purple or maybe red? In pictures below:
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If it's orange with a black stripe it's the hood lamp power.
It should have power on it at all times which may be why it's taped up.
 
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