It depends on how much weight you're pulling, and for how long. That winch draws 100+ amps under full load, and the 1450 alternator outputs 15 amps. The winch can draw amps 6x faster than you can replace them.
I use my 122 for winching logs, so added a large marine deep cycle battery for the purpose. Works great, just have to make sure I run the tractor long enough to fully recharge the battery after hard use.
http://www.onlycubcadets.net/forum/s...ighlight=winch