Circuit 300
Circuit 300 supplies battery voltage to the I/P junction block and IGN3 7.5A fuse. Circuit 300 is an Orange 14 gage wire. This circuit connects the ignition switch connector cavity "C" to I/P junction block connector cavity A6. Check for Opens/Shorts. Repair as needed. If this circuit is good, return to the possible cause list that sent you here and then check the next item.