Battery drains mechanic said water or moisture could create problem with computer.
battery: new
alternator: good
if computer what computer and how much to repair.
OK , why did you not ask the mechanic this question .
You need to perform a parasitic drain test to FIND the offending computer…or other electrical device draining the battery. Any good shop can do this test.
The PCM controls the alternator output from the signal it gets from the battery current sensor.
Has anyone checked if this sensor has failed?
Tester