Checking The Electrical Component; Measuring The Peak Voltage; Using The Digital Tester; Ignition Unit And Components - SELVA MARINE Kingfish 25 Service Manual

Checking the electrical
component

Measuring the peak voltage

When measuring the peak voltage, do not
touch any of the connections of the digital
tester probes.
When measuring
between the terminals of an electrical
component using the digital tester, make
sure that the leads do not contact any
metal parts. Otherwise, the electrical com-
ponent may short-circuit and be dam-
aged.
To check the electrical components or mea-
sure the peak voltage, use the special ser-
vice tools. A malfunctioning
component can be checked easily by mea-
suring the peak voltage. The specified engine
speed when measuring the peak voltage is
affected by many factors, such as fouled
spark plugs or a weak battery. If one of these
factors is present, the peak voltage cannot be
measured properly.
DC V
Digital circuit tester: 90890-03174
Peak voltage adapter B: 90890-03172
Checking the electrical component / Ignition unit and components
the peak voltage
electrical
Circuit diagram / CDI unit coupler layout /
TIP:
• Before measuring the peak voltage, check
all wiring harness for corrosion. Also, make
sure that the wiring harness is connected
properly and that the battery is fully
charged.
• Use peak voltage adapter B with the rec-
ommended digital circuit tester.
• Connect the positive pin of peak voltage
adapter B to the positive terminal of the dig-
ital circuit tester, and the negative pin to the
negative terminal.
• When measuring the peak voltage, set the
digital circuit tester to the DC voltage
mode.

Using the digital tester

The electrical technical data apply to the
measurements taken using the Selva-rec-
ommended tester.
The resistance values shown are the values
taken before the engine is started. The actual
resistance may vary depending on the envi-
ronmental conditions and ambient tempera-
ture.
The input voltage changes depending on the
battery voltage.

Ignition unit and components

Checking the ignition spark

• Make sure to install the special service
tool to the spark plug cap so that sparks
do not leak out.
• Keep flammable gas or liquids away,
since this test can produce sparks.
1. Disconnect the spark plug caps from the
spark plugs.
TIP:
To prevent the engine from starting when
cranking it, make sure to disconnect all spark
plug caps.
2. Connect the special service tool to a
spark plug cap.
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