They are a bit pricey but my WranglerNW 200 amp alternator is going strong. At idle it is at 14+Volts and is near max output. Stan Hackathorn is the man to talk to 800 962-2616. Kit includes new 1/0 welding cable charge and ground cables with a Mega or Maxi fuse for 250 amps. Make sure the batteries are still good and full charged before hooking the new alternator up. They can burn out trying to charge a dead battery. Not designed for that.