If you pull the upper and lower shrouds on your steering column you will see the single wire that goes right to where the key goes in.
This wire touches ground, the chime goes off, if it does not, no chime.
To disable it youcan cut the wire or pull the little metal plug out of the keyswitch and cover it with tape.
I disabled mine on the BII a long time ago because it wouldnt fit in the key switch right, then I locked my keys in the truck, twice. I fixed it so it works now