Look for a parasitic draw. There are plenty of videos on youtube for the method (usually on cars but the principal is the same). You will need a digital multimeter and some patience but you should be able to narrow it down to one circuit and go from there. HTH.
SOURCE: what size axle on a 2002 flhtcui
I'm pretty sure that the axle diameter on your bike is one inch as compared to 3/4" on earlier models.
SOURCE: 2002 HD FLHTCUI rear left
Can I ask if you have checked the speaker? This sounds like a bad speaker on the bike, not a circuit issue. When these speakers go bad that is what they do, they cut out and crackle real bad. To remove the speaker, simply unscrew the retaining ring and it it comes straight out of the arm rest. I have had to change several on my bike which is the same year and make as yours so I really suspect the speaker. I replaced them with the HD heavy duty speakers, not the premium sound ones but the heavier than stock models and have had no more issues with them.
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