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Did this swap this past weekend, easy as pie. Soldered in a new harness to the L wire, ran the blue sense wire to the output, then replaced all my power and ground cables with 2/0 welding cable. Used the beltr for a factory installed HO alternator, 5060968. Ran both heaters on high with the headlights on, 80amps draw @ 14.5vDC @ idle. Sweet.
I dont have any of this finished product, but I can tell you my factory brown wire is the one I soldered to the AD244 Harness yellow wire. Sense wire helps keep voltage steady.