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Alternator trouble

Tiny
RON SCHWARTZ
  • MEMBER
  • 1999 MITSUBISHI 3000GT
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
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
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Thursday, August 18th, 2011 AT 4:55 PM

2 Replies

Tiny
JDL
  • 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.
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Thursday, August 18th, 2011 AT 5:29 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Are you using oem alternator?
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Thursday, August 18th, 2011 AT 5:30 PM

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