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1999 Mitsubishi Montero gone through 2 alternators and 3 ba

Tiny
SMILESHAM
  • MEMBER
  • 1999 MITSUBISHI MONTERO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 95,000 MILES
What is going on with Mitsubishi's electrical system! I have checked several message boards that express the same problem I am having. I have a 1999 Montero and have had to replace the alternator twice and the battery 3 times. I have read all sort of things that I should do. Unfortunately I am not finding the same advice for this problem. I am hoping that you have heard of these burnt out alternator and battery occurrences. Please tell me what to do.



Thanks you in advance for your help.
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Friday, August 29th, 2008 AT 3:17 PM

8 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Is it under charging or overcharging?

I have heard of PCM problems with this situation. Also the brand of alternater can be significant. I would suggest USA, Napa premium orWorld wide on this one.
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Saturday, August 30th, 2008 AT 5:53 AM
Tiny
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How do I know if it is under charging or overcharging?

Also what is PCM?
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Monday, September 1st, 2008 AT 6:32 AM
Tiny
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  • MECHANIC
  • 9,123 POSTS
What brand alternater are you using?

Testing an alternater:

https://www.2carpros.com/how_to/how_to_test_alternator.htm

Some parts stores will do this as well.
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Monday, September 1st, 2008 AT 7:10 AM
Tiny
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  • 5 POSTS
It's a Master Quality Premium Remanufactured Alternator
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Monday, September 1st, 2008 AT 7:42 AM
Tiny
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  • 9,123 POSTS
IF it's out of spec, take it back and see if you can get one of these: USA, Napa premium orWorld wide.
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Monday, September 1st, 2008 AT 11:48 AM
Tiny
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  • MEMBER
  • 5 POSTS
The technician says there is a oil leaking into the alternator.
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Monday, September 1st, 2008 AT 12:07 PM
Tiny
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  • MECHANIC
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Well that would certaiinly cause a problem.
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Monday, September 1st, 2008 AT 6:01 PM
Tiny
SMILESHAM
  • MEMBER
  • 5 POSTS
FYI there seems to be an ongoing investigation into the mysterious oil leaks that keep causing alternator failures in Mitsubishi's Monteros. Based on my online research, anyone having this problem should have their mechanic check: camshaft, crankshaft front seals, all connections
are clean and in good condition, earth connections, alternator belt is it too loose, too tight or cracked, air conditioner belt, fuse box located near battery, slipping drive belt (it turns the alternator), and diode.

Also, if your alternator is 10 years old or older it probably just needs replacing.
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Tuesday, September 2nd, 2008 AT 2:09 AM

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