I could be wrong (happend before) but I understood that the Clasic Cruiser or TC models with the Freedom V92 starting in 03 both had the same alternator at 38amps. Just checked my owners manual and it says both handle 38amps but that wont be the first time to find documentation in error on something. I know another SC rider just added aux lights to his ride and didnt have any issues. I really don't think you have anything to worry about since you have an 03.
2011 White Vision - Nuvi 550, Lowers, Lloydz 2nd filter, Vic perf filter, CB/Icom, 96 Brake LED's, Clear Signal lens/Switchbacks, VIC Hwy Pegs, Stebel Horn, 7Jurock 15" Shield, PCV, Lloyd ATS and Variable intake, Ness honkers
2004 V92 TC - S1 flash, level 1 slip-on, Ness big sucker K&N, ISO Grips, 4x1.5 Highway Hawg Risers, extra chrome (never too much), JM 2k CB 4' antena, Mustang seat, HD Front TS & Lowers, OD Pulley
Retired Navy SCPO