positive lead on driver side valve cover

[flyingmachine]

I'm think about replacing the gasket my own but I found there is a positive lead going from the underside of intake manifold and wrapping around the front portion of driver side valve cover(under the black bmw spark plug cover). Then goes down the underside of engine.

Anyone knows how to clear the positive lead and proceed to take valve cover off?

I thought I could just take the alternator side off and then loose it a bit but when I further look at that positive lead, it seems to me the line splits down there and there is another portion going down to the engine somewhere.

please enlighten me.