This came off a 6.0 before it got a Cummins conversion. Alternator, brackets, pulleys, idlers — everything you need to make any 6.0 a dual alternator setup; even an Excursion! And programming the PCM to control both alternators is easy; just disconnect both batteries for 10 mins, then make sure both alternators are connected BEFORE hooking the batteries back up. The PCM will automatically discern that there are two alternators. I think the alternator might have a bad diode, but that is easily fixed.