Suzuki GS500E (1989-1997) [210/221] Fault finding equipment ref 3

Suzuki GS500E (1989-1997) [210/221] Fault finding equipment ref 3
2 If using a meter, check first that the meter
leads are plugged into the correct terminals
on the meter (see above). Set the meter to the
dc volts function, at a range suitable for the
battery voltage. Connect the meter red probe
(+ve) to the power supply wire and the black
probe to a good metal earth (ground) on the
motorcycle's frame or directly to the battery
negative (-ve) terminal (see illustration 14).
Battery voltage should be shown on the meter
with the ignition switched ON.
3 If using a test light or buzzer, connect its
positive (+ve) probe to the power supply
terminal and its negative (-ve) probe to a good
earth (ground) on the motorcycle's frame or
directly to the battery negative (-ve) terminal
(see Illustration 15). With the ignition ON, the
test light should illuminate or the buzzer
sound.
. When using a meter, check that its leads
are inserted in the correct terminals on the
meter, red to positive (+ve), black to negative
(-ve). Incorrect connections can damage the
meter.
. A voltmeter (or multimeter set to the dc
volts scale) should always be connected in
parallel (across the load). Connecting it in
series will destroy the meter.
. Voltage checks are made with the ignition
ON.
1 First identify the relevant wiring circuit by
referring to the wiring diagram at the end of
this manual. If other electrical components
share the same power supply Qe are fed from
the same fuse), take note whether they are
working correctly - this is useful information in
deciding where to start checking the circuit.
Fault Finding Equipment REF.23
1 To check the earth on a component, use an
insulated jumper wire to temporarily bypass
its earth connection (see illustration 16).
Connect one end of the jumper wire between
the earth terminal or metal body of the
component and the other end to the
motorcycle's frame.
A selection of jumper wires for making
earth (ground) checks
2 If the circuit works with the jumper wire
installed. the original earth circuit is faulty.
Check the wiring for open-circuits or poor
connections. Clean up direct earth
connections. removing all traces of corrosion
and remake the joint. Apply petroleum jelly to
the joint to prevent Mure corrosion.
Tracing a short-circuit
. . . or a test light - note the eerth
connection to the frame (arrow)
4 If no voltage is indicated, work back
towards the fuse continuing to check for
voltage. When you reach a point where there
is voltage, you know the problem lies between
that point and your last check point.
. A short-circuit occurs where current shorts
to earth (ground) bypassing the circuit
components. This usually results in a blown
fuse.
. A short-circuit is most likely to occur where
the insulation has worn through due to wiring
chafing on a component. allowing a direct
path to earth (ground) on the frame.
1 Remove any bodypanels necessary to
access the circuit wiring.
2 Check that all electrical switches in the
circuit are OFF, then remove the circuit fuse
and connect a test light, buzzer or voltmeter
(set to the dc scale) ecross the fuse terminals.
No voltage should be shown.
3 Move the wiring from side to side whilst
observing the test light or meter. When the
test light comes on, buzzer sounds or meter
shows voltage, you have found the cause of
the short. It will usually shown up as damaged
or burned insulation.
4 Note that the same test can be performed
on each component in the circuit, even the
switch.
(ground)
Checking the earth
. Earth connections are made either directly
to the engine or frame (such as sensors,
neutral switch etc. which only have a positive
feed) or by a separate wire into the earth
circuit of the wiring harness. Alternatively a
short earth wire is sometimes run directly from
the component to the motorcycle's frame.
. Corrosion is often the cause of a poor
earth connection.
. If total failure is experienced, check the
security of the main earth lead from the
negative (-ve) terminal of the battery and also
the main earth (ground) point on the wiring
hamess. If corroded, dismantle the connection
and clean all surfaces back to bare metal.

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