90-824052R3 JUNE 2002 ELECTRICAL - 2A-15
STATOR HIGH SPEED TEST
DVA RED DVA BLK 400 RPM 1000
RPM
3000
RPM
RED/WHT GROUND 25 - 50 120 - 160 230 - 320
1. If either the low speed or high speed reading to
switch box is BELOW specification, stator or
switch box is bad (test stator as outlined in Out-
board Service Manual; if stator checks to specifi-
cation replace switch box and repeat check)
IMPORTANT: If engine is equipped with an Idle
Speed Stabilizer and/or High Speed Spark Ad-
vance, disconnect and isolate both leads from
switch box and repeat check to rule out possible
stabilizer/spark advance malfunction.
2. If both the low speed and high speed readings are
WITHIN specification, proceed with Step 5-A.
5-A. Check switch box bias. Bias circuit may
checked using either a voltmeter or an
ohmmeter. (To use a voltmeter, see Test Chart,
following.) Use VOLTMETER only set on 20VDC
or 40VDC scale; DVA not required.
51838
NOTE: Using meter only, REVERSE LEAD POLAR-
ITY; connect leads as specified.
BIAS CIRCUIT TEST
DVA RED DVA BLK 400 RPM 1000
RPM
3000
RPM
GROUND WHT/BLK 1 - 6 3 - 15 10 - 30
Ohm Test:
1. Disconnect WHITE/BLACK wire from switch box
terminal.
2. With ohmmeter set to 1K scale, connect one ohm
lead to WHT/BLK switch box terminal and one
ohm lead to switch box case ground.
3. Ohmmeter should indicate 1300 - 1500 ohms.
Voltage Test
NOTE: Switch Box Bias Voltage is NEGATIVE (–)
voltage applied to the ignition system to raise the
trigger firing threshold as engine RPM is increased,
thus stabilizing ignition timing and preventing
random ignition firing.
1. If bias reading is BELOW specification, one or
both switch boxes are bad.
IMPORTANT: If engine is equipped with an Idle
Speed Stabilizer and/or High Speed Spark Ad-
vance, disconnect and isolate both leads from
switch box and repeat check to rule out possible
stabilizer/spark advance malfunction.
Replace OUTER switch box and recheck bias; if nec-
essary, replace INNER switch box and recheck bias.
2. If bias reading is WITHIN specification, and en-
gine still does not run or runs poorly, one or both
switch boxes or trigger is bad. [Test trigger as out-
lined in Outboard Service Manual; if trigger
checks to specification replace switch box(es)
and repeat check.]
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