Mercury 90 Service Manual

90-830234R3 DECEMBER 1997 ELECTRICAL - 2B-15
Rectifier Test
WARNING
Disconnect battery leads from battery before
testing rectifier.
NOTE: Rectifier can be tested without removing from
engine.
1. Disconnect all wires from terminals on rectifier.
2. Use an ohmmeter (R x 1000 scale) and perform
the following test. Refer to illustration for rectifier
terminal identification.
a
d
c
f
e
b
07300
a - Terminal
b - Terminal
c - Terminal
d - Stator Terminals
e - Positive Terminal
f - Ground
Continuity Indicated.
Replace Rectifier.
Connect RED meter lead to ground,
BLACK lead alternately to terminals “a”
and “c”.
Continuity Indicated.
Connect BLACK meter lead to ground,
RED lead alternately to terminals “a”
and “c”.
No Continuity Indicated.
Connect BLACK meter lead to ground,
RED lead alternately to terminals “a”
and “c”.
No Continuity Indicated.
Connect BLACK meter lead to terminal “b”,
RED lead alternately to terminals “a” and
“c”.
Continuity Indicated.
Replace Rectifier.
Continuity Indicated.
Connect BLACK meter lead to terminal “b”,
RED lead alternately to terminals “a” and
“c”.
No Continuity Indicated.
Replace Rectifier.
Continuity Indicated.
Connect RED meter lead to terminal “b”,
BLACK lead alternately to terminals “a” and
“c”.
No Continuity Indicated.
Replace Rectifier.
No Continuity Indicated.
Connect RED meter lead to terminal “b”,
BLACK lead alternately to terminals “a” and
“c”.
Continuity Indicated.
Replace Rectifier.
No Continuity Indicated.
Rectifier tests OK.
No Continuity Indicated.
Replace Rectifier.
Continuity Indicated.
Rectifier tests OK.

Mercury 90 Specifications

General

Brand	Mercury
Model	90
Category	Outboard Motor
Language	English