Mazda 121 - Electrical Troubleshooting Tools; Test Light; Jumper Wire; Voltmeter

GI
CAUTION
9MUGIX
O2O
VOLTMETER
GFOUNO
9MUGIX.O21
05uGtx-021
9MUGIX 045
ELECTRICAL
TROUBLESHOOTING
TOOLS
Test Light
The test-light,
as shown
in the
figure, uses
a
12V bulb.
The
two lead
wires should
be connected
to
probes.
The test light
is used
for simple
voltage
checks
and
for check-
ing
for
short
circuits.
Caution
.
When checking
the
control
unit,
never
use a bulb
over 3,4W.
Jumper
Wire
The
lumper
wire is used
tor testing
by shorting
across
switch
terminals
and
ground
connections.
Caution
.
Do not connect
a
iumper
wire from
the
power
source
line to
a body
ground;
this
may
cause burning
or
other
damage
to
harnesses
or electronic
com'
ponents.
Voltmeter
The
DC
voltmeter
is used to
measure
of circuit
voltage.
A volt-
meter
with a range
of
15V or
more is used
by
connecting
the
positive
(+) probe
(red
lead
wire) to
the
point
where
voltage
is to be
mi;asured
and
the
negative
(-) probe
(black
lead
wire) to a body
ground.
Diagnosis Connector
Insert
the
probe
into
the service
hole
when connecting
a
jum-
per
wire to the diagnosis
connector.
Caution
.
Do not insert
the
jumper
wire
probe
lnto
the diag'
nosis connector
terminal,
which
may
damage
the
terminal.
Ohmmeter
The
ohmmeter
is used
to
measure
the resistance
between
two
ooints
in a circuit
and
also
to check
for continuity
and diagno-
sis of short
circuits.
Caution
.
Do not attempt
to
connect
the ohmmeter
to any
cir-
cuit to
which
voltage
is applied;
this
may burn
or
otherwise
damage
the
ohmmeter.
9MUGIX.O19
Gl-12