Installing Flasher Turn Signals
- By Pete Snidal (C) 2003
Turn Signals can be installed on a motorcycle with their own separate
wiring harness, tied alongside the main one. There are few components
required, and not much in the way of wires.
Components Required
- Turn Signal Lights - amber in front, red in rear
- The Handlebar Switch
- The Flasher
- The indicator lamp(s) or buzzer
- The Wiring Loom
A Word On Flashers
There are many kinds of automotive flashers. Some are very finely-tuned
to the load of the lights in the system, so that they won't flash, or indicate,
if a bulb is burnt out. If you use one of these, you'll have to buy one that
is for the specific load of your bulb combination.
Fortunately, there are also "Heavy-Duty" flashers. These will flash over a
much wider range of loads, and are therefore simpler to design a system around.
They will not, however, provide any indication of bulbs not working properly.
There are also "2 terminal" and "3 terminal" flashers. The third terminal
is for an indicator light, which will flash when the signals do. This may
also be used to drive a small piezo-electric buzzer, obtainable at your
electronic supply store.
Installing Turn Signals
- Secure all parts and assemble your tools
- Mount all parts. Flasher should be mounted in a convenient place,
protected from weather. Handlebar switch, turn signal lights, and, if
required, an indicator light should be mounted on the handlebar or in
the headlight shell. If you chose to use a buzzer for the indicator, mount
this also in the headlight shell.
-
Electrical Connections are very simple. The signals on each side are
wired together, with either of them fed by one or the other side of the
turn signal switch. Connect a wire to the rear signal on one side. Route
this wire along the frame to the front signal. At the same time, connect
a wire from the front signal to the appropriate output wire from the
switch. Do the same for the other side.
- The switch is a single-pole double-throw switch. This means that
there is a feed wire, and two load wires. The feed wire must be fed from
the electrical system through the flasher. Connect the flasher to an
"ignition on" hot spot, such as one of the "hot" coil wires, and the output
line to the switch input wire.
|
 Turn Signal Schematic Diagram |
- If an indicator is desired, you can either chose a flasher with an
indicator output, or connect a pair of indicators, one to the branch
circuit for each side. If you choose to use a buzzer, you'll need a flasher
with indicator output.
Once you've made all the connections, routing the wires carefully, test
the circuits. Turn on the ignition, and try the handlebar switch for
both directions. Once performance has been ensured, wrap the wires with
electrical tape into a loom, starting at the rear and working forward.
You may wish to snap-tie this loom to your frame and/or your main wiring
harness.