tons of sudden issues, alternator?

[petebert]

05 x5, I don't drive it often. Primarily wife and daughter. Wife started reporting 4x4 and Brake light coming on, not all the time, intermittently. Daughter said that when it comes on you lose a lot of power.


I do keep it maintained and have the ECS/Schwaben scanner and haven't had much in the way of codes/errors. I scanned it after they reported having issues and there were a ton of codes and errors. Misfires, idle air controller, no communication DCS, no communication ABS, servotronic open circuit, torque limited, probably some others I'm forgetting.


I drove it with the scanner tool on the dash set to voltage. It held 13.4-13.6 volts and it drove fine. Then thought to turn on every electrical device I could think of. headlights, wipers, radio, still fine but then when I turned the AC on the whole dash lit up. Engine failsafe mode, 4x4, and brake. Voltage on the reader initially dropped to 13.1 and I even saw 12.9 for a moment. So think I'm pretty safe to just replace the alternator? Oh and as far the battery. It was showing 12.2 before I started it this morning.