Black and Yellow should not be grounded.
RED feed the ignition switch from the battery fused link.
Black + yellow ( position 2 - engine run) Feeds some fuses and the ingnition relay. This is designated circuit 15-x ( x being sub-circuit numbers )
Don't confuse ignition with starting they are two seperate circuits
Starting is circuit 50-x Which is black and Blue from the ignition switch to the inhibit/anti-theft relay and then black and blue to solder joint S-1039 which acording to the data is near the rear WashWipe motor loom where it becomes black and red untill the starter motor.
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