powerstroke 6.7 Charging system message (watch this) 

2017 F350 Powerstroke 6.7 Diesel Service Charging System message. alternators checked out @ max voltage reading 15+ Volts. Found damage to the yellow & red wire on pass side lower block wire cradle with wires stretched over the outside of cradle & taped in position. found shielding damage with corrosion inside causing a break! repaired single wire & problem solved!