Triumph Tigress TW2 Service Sheet Download

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SERVICE SHEET

No. 1050 (contd.)

Output Control

The standard circuit has the output wires from the generator connected by their snap connectors to

similarly coloured wires on the wiring harness and provides the following output control.

Lighting Switch in "OFF" Position

The output is taken from one pair of coils by means of the Green/White and Green/Black wires, and

the remaining coils (Green/White and Green/Yellow wires) are open-circuited.

Lighting in Switch "PILOT" Position

Output taken from one pair of coils by Green/White and Green/Black wires as before and the

remaining coils are on open-circuit. Lighting Switch in "HEAD" Position

All three pairs of coils are connected in parallel and the maximum output is obtained. Note.To

provide an increased charging rate with the lighting switch in the "OFF" position, some models will be
found to have the wire joining terminals 5 and 6 of the headlamp switch removed. This means that no coils
are shorted out in this switch position and the charging rate is slightly increased.

In circumstances where a considerable amount of low speed running is necessary or there are long

periods of parking with the lights on, it is possible to increase the charging rate with the lighting switch in the
"OFF" and "PILOT" positions by connecting the Green/Yellow alternator cable by its snap connector to
the Green/Black harness cable and the Green/Black alternator cable to the Green/Yellow harness cable.

The Green/White cables should not be disturbed. These alternative connections considerably

increase the charging rate in these switch positions, and the connections should be returned to standard for
normal conditions of use or long runs.

Owing to the effects of the above modifications it is essential that the wiring circuit is returned to

standard before checking the charging rates during fault finding.

Emergency Starting

With the ignition switch in the "EMG" position, the battery is not isolated from the alternator and

will, in fact, receive a charge whilst the machine is being run.

This arrangement is also a safeguard against continuous running in the "EMG" position. The back

pressure of the battery will increase as it is charged, until it is sufficiently strong to affect the working of
the ignition system. When this happens misfiring will occur, resulting in poor engine performance. In view of
this, always check that the machine is not being run with the ignition switch continually in the "EMG"
position, before testing the system for other faults.

Motor Cycle Trials Events, etc.

When using the machine for trials riding, the alternator can be used continuously in the "EMG"

position without a battery, providing the lead from the main harness to the battery negative terminal is
earthed to the machine, but contact points are liable to become badly burned.

Test Procedure

As the lights and other equipment are operated on a normal D.C. circuit they can be checked by

normal continuity tests with a battery and bulb.

The following equipment is required to satisfactorily test the charging circuit. The meters used should

be accurate moving coil instruments.

A.C. voltmeter scale 0-15 volts

I ohm. load resistance

D.C. ammeter scale 0-15 amps.

12 volt battery and 36 watt bulbs

D.C. voltmeter scale 0-15 volts