Checking The Electrical Components; Measuring The Peak Voltage; Measuring The Lower Resistance - Yamaha F50A Service Manual

Special service tools / Checking the electrical components
Checking the electrical
components

Measuring the peak voltage

The condition of the ignition system can be
determined by measuring the peak voltage.
Cranking speed is effected by many factors,
such as fouled or weak spark plugs, or a
weak battery. If one of these factors is
present, the peak voltage will be lower than
specification. In addition, if the peak voltage
is lower than specification the engine will not
operate properly.
DC V
NOTE:
• Use the peak voltage adaptor with the digi-
tal circuit tester.
• When measuring the peak voltage, set the
selector on the digital circuit tester to the
DC voltage mode.
• Connect the positive pin on the peak volt-
age adaptor to the positive terminal of the
digital circuit tester.
62Y3A11

Measuring the lower resistance

When measuring a resistance of 10 Ω or less
8
with the digital circuit tester, the correct mea-
surement cannot be obtained because of the
internal resistance of the tester.
To obtain the correct value, subtract the inter-
nal resistance from the displayed measure-
ment.
Correct value =
displayed measurement – internal
resistance
NOTE:
Obtain the internal resistance of the digital
circuit tester by connecting both of its probes
and checking the display.
S62Y8020
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