I cant find information regarding the back of my fuse panel. I’m upgrading to a 150amp alternator in my 350 Chevota but the wire in question appears to be original.. I was told by Powermaster that I need to run a heavier guage (6) from the alternator to the fuse panel. It is a White/Blue. I pull the box and I have two of them coming into the fuse panel. I have a picture below. Can anyone tell me which one of the two is the “power wire” coming directly from the alternator? I have plugged in the battery and both of them show voltage of 12v+ with the ignition off. Appreciated.