Triumph Trident T160 - Fault Finding in the Low Tension Circuit; Checking the Low Tension Circuit for Continuity

ELECTRICAL SYSTEM H
H3 PART A. CHECKING THE LOW
TENSION CIRCUIT FOR CONTINUITY
To c1,eck whether there is a fault in the low
tension circuit and to locate its position; the
following tests should be carried out:-
First inspect the in-line fuse in the battery
earth cable (brown/blue lead) and replace if
suspect.
Check also the cut-out switch; this can be
done by disconnecting the white, and
white/yellow lead from the right handl~bar
switch and connecting them together. This will
complete the ignition circuit by by-passing the
cut-out switch.
H3 PART B. FAULT FINDING IN THE
LOW TENSION CIRCUIT
To trace a fault in the low tension wiring,·tum
the ignition switch on and then place a piece of
insulating
material between all sets of
contacts whilst the following test is carried
out.
Note.
Disconnect the Zener Diode before the
test is carried out. To do this remove the
brown/blue lead from the Diode centre
terminal.
For this
test, it is assumed that the twinseat is
lifted and
the wiring is fully connected as
shown in the wiring diagram, Section H20.
With the aid of a 0-15 range D.C. voltmeter
and 2 test-prods, make a point to point check
along the low tension circuit starting at the
battery and working right through to the
ignition coils, stage by stage, in the following
manner, referring
to the wiring diagram in
Section H20.
(1) First, establish that the battery is earthed
correctly by connecting the volt meter
across the battery negative terminal and
the machine frame earth. No voltage
reading indicates that the red earthing
lead is faulty.
Check the fuse in the main
negative lead. Also, a low reading would
indicate a poor battery earth connection,
or a discharged battery.
(2) Connect the voltmeter in turn between
each ignition coil {-Vel terminal and earth
on all three coils. No voltage reading
indicates a breakdown between the
battery and the coil {-Vel terminal. ot th"t
the switch connections are faulty.
(3) Connect the voltmeter between ignition
switch input terminal and earth. No
reading indicates that tl,e brown and blue
lead
has faulty connections. Cileck for
voltage at the brown/blue lead connec-
tions at rectifier.
(4) Connect the voltmeter across igl1ltlon
switch output terminal (2) and earth. No
reading indicates that the ignition· switch
is faulty and should
be replaced. Battery
voltage reading
at this point but not at the
ignition coil (-Ve)
terminals indicates that
the ballast resistor has become "open
circuit" or become disconnected.
Remember that the ballast resistor is
by-passed, and the ignition coils fed
directly from
the battery via the Starter
relay, when the starter button is
depressed.
(5) Connect the voltmeter across the {+Vel
terminal of each coil and e·arth in turn. No
reading on the voltmeter between any
one coil and earth indicates that the coil
primary winding
is faulty and a replace-
ment ignition coil should be fitted.
(6) With insulating material still retained
between the three sets of contacts,
connect the voltmeter across each set of
contacts in turn. No reading between any
one set of contacts and earth indicates
that there is a faulty connectbn or the
internal insulation
has broken down in
one of the condensers.
If a condenser is suspected then a sub-
stitution should be made and are-test
carried out.
171 Finnaly, reconnect the Zener Diode
brown/white lead and then connect the
volt
meter between the Zener Diode
centre terminal and earth. To volt meter
should read battery volts. If it does not
the Zener Diode is faulty and a
substitu-
tion should be made. Refer to Section
H6 (page Hi31 for the correct procedure
for testing a Zener Diode on the machine.
Ignition coil
check procedure is given IrI
Section H3 part C.
H5
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