Mercury 90 Service Manual

2A-34 - ELECTRICAL 90-830234R3 DECEMBER 1997
ENGINE RUNNING AT IDLE:
It is not necessary to perform this test if the voltage
output was tested in the previous step CRANKING
ENGINE.
Red Stator Output Test 400 DVA Scale
Positive Meter
Lead (+)
Negative
Meter Lead (–)
DVA
Reading
Connect to
Green Test
Harness Lead
Connect to
Black Test
Harness Lead
200 - 350
Stop Circuit Output Test 400 DVA Scale
Positive Meter
Lead (+)
Negative
Meter Lead (–)
DVA
Reading
Connect to
Black/Yellow
Test Harness
Lead
Connect to
Black Test
Harness Lead
200 or Higher
If stator output is low, go to Testing Stator Resistance.
Trigger Output Test 20 DVA Scale
Positive Meter
Lead (+)
Negative
Meter Lead (–)
DVA
Reading
White Test
Harness Lead
Black Test
Harness Lead
2 - 8 Volts
If reading is below specifications replace trigger. If
reading is above specifications check CDM.
NOTE: If voltage remains low after installing a new
trigger, replace CDM.
Resistance Tests
RED STATOR
1. Disconnect stator leads.
NOTE: Resistance varies greatly with temperature.
Measurements should be taken with an ambient tem-
perature range of 65 to 85 degrees F.
Red Stator Resistance Test
R x 10 Ohms
Positive Meter
Lead (+)
Negative
Meter Lead (–)
R
x
10
Ohms
Scale
Connect to
White/Green
stator lead
Connect to
Green/White
stator lead
660-710
Connect to
White/Green
stator lead
Connect to
engine ground
No continuity
Connect to
Green/White
stator lead
Connect to
engine ground
No continuity
IMPORTANT: If all CDM stator output voltage is
low and stator resistance tests are within specifi-
cations, then each CDM (one at a time) must be
replaced with a CDM known to be good until sta-
tor output voltage returns to proper levels. This
process of elimination will reveal a defective
CDM.
RX10
TRIGGER
A resistance test is not used on the trigger. Test trig-
ger as outlined under “Testing Voltage Output to
CDM” - “Trigger Output Test”.

Mercury 90 Specifications

General

Brand	Mercury
Model	90
Category	Outboard Motor
Language	English