MK4 Golf/Jetta/Beetle cabin relay panel to battery fuse box cable. This is the largest red one in the fuse box and is positioned right next to the alternator cable. Can sometimes be damaged when fuse boxes melt due to the poor condition alternator cable but can also cause high resistance on it's down due to corrosion and poor connection. These 6AWG cables are properly crimped and then dip soldered for a solid and more weather resistant connection.