Triumph Tiger Explorer XR 2017 Service Manual page 19

Tiger Explorer XR Series
the bulb resistance can be calculated by using -
To use either of the following triangles, put your finger over the value you want to find. Multiply the remaining
values if side by side, or divide if one is over the other.
Basic Electrical Circuits
Basic Circuit Diagram
In the above circuit an electrical reservoir (the battery) is connected via a cable to a terminal on the controlling
device (the switch) whose contacts are either open or closed. The other terminal on the switch is connected via
a cable to the consumer (the bulb), and the other side of the bulb filament is connected to ground (earth) by
another cable. The ground point is usually a part of the frame or engine, to which the battery negative terminal is
also connected.
When the switch contacts are open (as shown in the diagram), the circuit is broken and no current flows. When
the switch contacts are closed, the circuit is made and current flows from the battery positive terminal through
the switch contacts and bulb filament to ground. The frame completes the circuit to the battery negative terminal
and the bulb illuminates.
Although some circuits on the circuit diagram may at first seem more complicated, it will generally be found that
they can be broken down into sections which do not differ greatly from the basic circuit above.
Circuit Diagrams
Circuit diagrams are created to provide a 'picture' of the electrical system and to identify the route taken by each
individual wire through the system, in order to identify which components it feeds and which connectors the wire
runs through. Circuit diagrams are an essential tool for fault finding, as it is possible to locate start and finish
points for a circuit without having to manually trace the wire through the motorcycle itself. Circuits diagrams may
look confusing at first but when they are studied closely they soon become logical.
Due to the complex circuits and the number of individual wires, Triumph uses two types of circuit diagram in its
Service Manuals.
Within the manual, conventional circuit diagrams are used to show the layout of the main circuits of the
motorcycle. These are: Engine management/ignition, Lighting, Starting and Charging and Auxiliary and
Accessory. In these diagrams no attempt is made to show the components of the system in any particular
order or position in relation to the motorcycle.
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GENERAL INFORMATION