Mercury MerCruiser MCM 454 Mag MPI Service Manual page 378

SERVICE MANUAL NUMBER 23
3. Meter should indicate a high or infinite resistance (no meter movement) when
4. Repeat Steps 1 through 3 for two other rectifiers in heat sink.
5. Replace assembly if any one of the rectifiers is shorted or open.
6. Connect one lead of an ohmmeter (set on R x1) to the common side of the diode and
7. Reverse leads and again note reading.
8. Meter should indicate a high or infinite resistance (no meter movement) when con-
9. Repeat Steps 6 through 8 for the other two diodes.
10. Replace rectifier assembly if any one of the diodes is shorted or open.
Index
90-861326--1 MARCH 1999
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connected one way and a low reading when connected the other. If both readings are
high or infinite, rectifier is open. If both readings are low, rectifier is shorted.
a - Stud
b - Rectifier Terminal
c - Repeat Test Between These Terminals And Stud
the other lead to the other side, of one of the three diodes.
a - Common Side Of Diode Circuit Board
b - Repeat Test For Two Diodes
nected one way and a low reading when connected the other. If both readings are high
or infinite, diode is open. If both readings are low, diode is shorted.
b
c
a
b
a
CHARGING SYSTEM
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