alternator trouble

140,000 MILES • 6 CYL • 4WD • AUTOMATIC
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RON SCHWARTZ
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  • 1 POST
1999 Mitsubishi Montaro sport. I have had to replace three alternators in the last year. The last one lasting for three weeks. Could there be a short causing them to go bad. I have disconnected the power lead from the Alt and at the battery and have I have a closed circuit. However from the power lead at the Alt to body ground I am showing OMS. It looks like a short, shorting out the ALT. Where would I start to find the short or is there something I'm missing.
Thank you
Aug 18, 2011 at 9:55 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Wiring diagram below. The three red wires are hot all the time. The wire going to the L terminal, goes hot when you turn on the key.
Aug 18, 2011 at 10:29 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
Are you using oem alternator?
Aug 18, 2011 at 10:30 AM
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