Electrical System; Checking The Electrical Component; Measuring The Peak Voltage - Yamaha 55DEHD Service Manual

ELEC
Checking the electrical
component

Measuring the peak voltage

To check the electrical components or mea-
sure the peak voltage, use the special ser-
vice tools. A faulty electrical component can
be easily checked by measuring the peak
voltage. The specified engine speed when
measuring the peak voltage is effected by
many factors such as fouled spark plugs or a
weak battery. If one of these factors is pre-
sent, the peak voltage cannot be measured
properly.
w
When checking the peak voltage, do not
touch any of the connections of the digital
circuit tester leads.
cC
When testing the voltage between the ter-
minals of an electrical component with the
digital tester, do not allow any of the leads
to touch any metal parts. If touched, the
electrical component can short and be
damaged.
8-1

Electrical system

6B480015
NOTE:
9 Before measuring the peak voltage, check
all wiring for proper connection and corro-
sion, and check that the battery is fully
charged.
9 Use the peak voltage adapter B with the
recommended digital circuit tester.
9 Connect the positive pin of the peak voltage
adapter B to the positive terminal of the dig-
ital tester, and the negative pin to the nega-
tive terminal.
9 When measuring the peak voltage, set the
selector on the digital circuit tester to the
DC voltage mode.
Digital circuit tester: 90890-03174
Peak voltage adapter B:
90890-03172
6885J11