The Black/Yellow wire receives battery voltage direct from ignition switch and is power supply is missing, you are not going to get any sparks. It could be a faulty ignition switch or a break in the circuit.
Turn ignition switch on and note if the dash warning lights are all working. Turn key slowly to start and note if the lights go out all at once. If engine starts or tries to start and stalls when key is released to return to run position, you have a bad ignition switch.
Wednesday, September 19th, 2012 AT 9:29 PM