It's not brushless. The only brushless alternators I am aware of are some of the bigger/biggest Delco units. They are big, and have a unique appearance to the case due to the configuration of the rotor and the stationary field winding in the rear part of the alt case. In theory, the only thing that should ever wear out on a brushless alternator are the bearings. They're expensive suckers though. As long as brush-type alternators last, I'm not gonna shop for a brushless unit unless its the kind of deal I got on my AVi160'sI did some research on it and it should work in stock form for now one company online sells a rear case upgrade to a dual rectifier. If I’m not mistaken this alternator is brushless and supposed to charge good at idle.