The alternator does not have a voltage regulator, it is PCM controlled. It is likely a bad connection, frayed or chafed wires.One looks clearer than the other diagram.
PLEASE NOTE: Some diagrams may appear to be missing because of gaps in the number sequences. These "gaps" are actually for diagrams that do not apply to the vehicle model selected.
Where is the battery junction box? Is it the fuse box under the hood (drivers fender area)?
Also, where are fuselink A & B located?