Mercury 90 Service Manual

2A-18 - ELECTRICAL 90-830234R3 DECEMBER 1997
RED Stator with Adaptor and Ignition Coils
RED Stator DVA Test
Test
Selector
Switch
Position
RED DVA
Lead
BLACK DVA
Lead
Voltage
@ 300 RPM
Voltage
@ 1000 RPM
Voltage
@ 4000 RPM
Coil Primary 400 VDC*
Coil (+)
Terminal
Coil (–)
Terminal
130 Volts
Minimum
195 to 275 195 to 275
Stop Circuit 400 VDC*
Black/Yellow
Sw. Box
Terminal
Ground
190 Volts
Minimum
275 to 320 260 to 320
Blue Sw. Box
Terminal
400 VDC*
Blue Sw. Box
Terminal
Ground
190 Volts
Minimum
275 to 320 260 to 320
Blue/White Sw.
Box Terminal
400 VDC*
Blue/White Sw.
Box Terminal
Ground
190 Volts
Minimum
275 to 320 260 to 320
Switch Box
Bias
20 VDC or 40
VDC
Ground (1)
White/Black
Switch Box
Terminal (1)
2 to 10 10 to 30 10 to 30
(1) Using meter only, REVERSE LEAD POLARITY; connect leads as specified
NOTE: If using a meter with a built -in DVA, place selector switch in the DVA/400 VDC position.
Electric Start Engines
Red Stator Resistance Test
(all wires disconnected)
R x 1 Ohms
Positive Meter
Lead (+)
Negative
Meter Lead (–)
Scale
Connect to
White/Green
stator lead
Connect to
Green/White
stator lead
660 - 710
Connect to
Yellow stator
lead
Connect to
Yellow stator
lead
0.165 - 0.181
Manual Start Engines
Red Stator Resistance Test
(all wires disconnected)
R x 1 Ohms
Positive Meter
Lead (+)
Negative
Meter Lead (–)
Scale
Connect to
White/Green
stator lead
Connect to
Green/White
stator lead
660 - 710
Connect to
Blue/White
Connect to
Black
130 - 145
Connect to
Yellow stator
lead
Connect to
Yellow stator
lead
0.17 - 0.19
NOTE: Resistance varies greatly with temperature.
Measurements should be made within an ambient
range of 65 to 85 degrees F
° .
NOTE: The stator for manual start engines have a
BLUE/WHITE and a BLACK wire which provide pow-
er for the over-heat horn and overspeed limiter mod-
ule.
Troubleshooting Procedures
ALL MODELS –
If the DVA reading is HIGH (particularly @ 1000
RPM) the ADAPTER MODULE is defective.
If the DVA reading is LOW, the stator, adapter mod-
ule or switch box may be defective. Refer to the par-
ticular engine model procedure, following, to isolate
the problem.

Mercury 90 Specifications

General

Brand	Mercury
Model	90
Category	Outboard Motor
Language	English