Gold Lifetime Member
Join Date: Jan 2000
Location: Wilton, Ca. USA
The yellow wire from the starter solenoid to the "+" side of the coil was to give 12 volts to the coil during cranking on point type ignitions. If you no longer have points, it is not needed.
It probably won't be needed even with points since you have the 6AL which gives you a much stronger spark during cranking. Even without the wire hooked up a points-only system will start; it just starts easier with it hooked up.
Bottom line, it should work fine dis-connected. If you want to hook it up, call the MSD tech line at (915) 855-7123. They are very specific that only their orange wire attaches to the coil so it can't go there. It probably can be hooked up to the regular red wire from the key but I would check with them first. If it starts fine without it (and I believe it will), I would just tape it off.