S.l.o. W. Warning System Tests; Function Test; Blocking Diode Test - Johnson J10RLSRD Service Manual

Surface Leakage Test
The ignition coil and spark plug lead should be
tested for leakage or insulation failures using the
ignition analyzer. Leakage is caused by moisture,
cracks, or holes in the coil housing or spark plug
leads.
With the analyzer's black and red leads still con-
nected from the Power Test, remove the ana-
lyzer's high tension lead from the coil. Turn on the
analyzer and probe the entire surfaces of the coil,
spark plug lead, and spark plug cover.
Flashover will be apparent wherever insulation
has broken down. Replace any coil or spark plug
lead which shows leakage.
S.L.O. W. WARNING
SYSTEM TESTS
25/30
MODELS
This ignition system incorporates the S.L.O
w.
™
(Speed Limit Overheat Warning) system , which
limits engine speed to approximately 2000 RPM if
engine temperature exceeds 180°F (82°C). Once
the
S.L.O W.
warning system has activated, the
engine must cool to 155°F (68°C) and the out-
board must be slowed to an idle before normal
operation can be resumed.
The S.L.O W. warning system depends on input
from the temperature switch tan/red lead.
IGNITION
S.L.O.W. WARNING SYSTEM TESTS
Function Test
Disconnect temperature switch tan/red lead .
Install correct test propeller. Start outboard in test
tank and run at 3500 RPM .
Touch engine harness tan/red lead to a clean
engine ground.
• If engine speed slows to approximately 2000
RPM (normal operation), test the temperature
switch.
• If engine does not slow to approximately 2000
RPM , check wiring or replace power pack.
IMPORTANT:
On remote electric start models, if
the engine goes into S.L.O. W. repeatedly or if the
I
engine goes into
S.L.O W.
without an operator
warning signal, check the engine harness block-
ing diode. Refer to Blocking Diode Test.
Blocking Diode Test
25/30
REMOTE ELECTRIC MODELS
The diode is located in the engine harness tan
wire circuit.
1
1. Diode
DRC6251
Disconnect engine harness 6-pin Deutsch con-
nector containing the tan wire, and the tempera-
ture switch tan lead.
Calibrate ohmmeter on appropriate scale. Using
jumper wires, connect meter between engine har-
ness tan lead and engine harness 6-pin connector
terminal 6. Note reading.
Reverse meter connections or press polarity but-
ton. Note reading .
• A very high reading in one direction and a low
reading in the other direction indicates diode is
good.
Replace engine harness blocking diode if your
test results are not correct.
Complete all circuits disconnected during this test.
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