Why are you looking for it ?? Need more info.
Could you post a pic of what you have ??
Both of those wires are black... but look closely. One is a plain smooth black wire, the other has a slight striped effect to it. Which wire goes where is lost to memory at the moment, however................
One wire normally have a bullet type plug in terminal... that connects to the TAN wire you see protruding at some point from the wiring harness under the hood.
The other wire should have a regular thru bolt type terminal that bolts to a powerhead ground.
Let us know if this helps you or if you need further info.