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Can the PCM make a new alternator go bad?

Tiny
GMAN316
  • MEMBER
  • 2003 MAZDA 6
  • 154,000 MILES
I replaced the alternator twice. After I replaced it the first time I had it checked and it was bad. So I replaced it again and the charging system light is still on and the problem is still occuring the same exact way it was before. Also just put a brand new battery in when I replaced this alternator. The problem happened as I was test driving it around the block. So my question is can the PCM cause the alternator to go bad or did I just get another bad alternator or is there some other problem?
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Wednesday, July 11th, 2012 AT 2:39 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
PCM would not normally make ALT fail BUT PCM does regulate ALT output so PCM could keep ALT from working
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Wednesday, July 11th, 2012 AT 2:45 PM
Tiny
GMAN316
  • MEMBER
  • 4 POSTS
So should I take it to see if the PCM is bad or just replace the alternator again?
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Wednesday, July 11th, 2012 AT 2:55 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Remove ALT from car have tested if good then PCM at fault or wiring
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Wednesday, July 11th, 2012 AT 2:59 PM

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