Coil wiring colors - Pelican Parts Forums Pelican Parts Forums > Porsche Forums > Porsche 914 & 914-6 Technical Forum: Coil wiring colors User Name: Remember Me? Password: Register: Garage FAQ: Social Groups Early cars supplied power to the coil through a black wire with a red stripe. On later cars that was just black. The wire comes from the relay board.No spark at the coil914-6 Ignition WiringSee more results Porsche 914 Ignition Troubleshooting | (1969-1976 The device that does the energy storage and concentration is the coil. The basic laws of physics state that a coil of wire (more so when wound on an iron core) is an inductor, i.e. it exhibits the electrical property of inductance. Inductance is the ability of an inductor to oppose any change in the amount of current flowing through it.