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.
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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