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??
Apr 23, 2011 at 1:14 AM
Bmw Part
1989 BMW 525I
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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.
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.
Apr 23, 2011 at 1:24 AM
HI: again HOW DO I KNOW WHICH ONE I NEED????? without taking the OLD one OFF???
Apr 23, 2011 at 2:06 AM
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