Yes is has power when the ignition is turned on
The GQ alternator has 3 electrical connections
B+.......10mm nut
S - battery sensor (2 pin plug)
L - warning light (2 pin plug)
Run some 8B&S cable from the B+ terminal of the alternator to the battery in conduit. You will also need an 80amp fuse. Mount this as close as possible to the battery's positive post, connect the cable from the alternator to one side of the 80amp fuse and the other side of the fuse to the positive battery post.
The S terminal at the alternator can be connected to the B+ terminal at the alternator. Make up a short lead and connect the S to the B+. This can be light gauge wire such as 3mm.
The L terminal needs to be connected to a warning light in the dash.