Being that new it should have the electronic voltage regulator. The alternator should have three wires going to it. The big battery wire then two field wires. You should check voltage right at the output of the alternator if you haven't already. Also check voltage at both the field wires @ the alternator. It should be regulated between 13.8 to 14.2 volts. The new regulator or alternator could be bad. Wouldn't be the first time
