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BMW Part

Tiny
DSMSPENCE2001
  • MEMBER
  • 1989 BMW 525I
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 220 MILES
I have a 1989 bmw 525i 2.5L I need a new alternator I don't know which one I need 115amp pr 140amp how can I know before taking off old one?
Saturday, April 23rd, 2011 AT 1:14 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Yours has the Bosch 55 amp

Bosch alternators are conventional 3-phase, self-rectifying type alternators. Bosch 55 through 75-amp alternators use 3 positive and 3 negative diodes connected to stator windings to rectify current. Bosch 80 and 90-amp alternators use 14 diodes.
All alternators use 3 exciter diodes connected to stator windings. These diodes turn off the alternator indicator light and supply power to the voltage regulator while the engine is running. Bosch regulators are transistorized solid state and integral with alternator.
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Saturday, April 23rd, 2011 AT 1:24 AM
Tiny
DSMSPENCE2001
  • MEMBER
  • 2 POSTS
HI: again HOW DO I KNOW WHICH ONE I NEED? Without taking the OLD one OFF?
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Saturday, April 23rd, 2011 AT 2:06 AM

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