SOURCE: 2007 harley softail turn signals left side stoped
More than likely a broken wire you will have to trace
SOURCE: left turn signal not working proper
Turn signals flashing is the confirmation of alarm system being on.I thought both sides flashed but if alarm is faulty guess that's messed up too. Try starting from stratch with alarm,disarm it[disconnect neg wire at battery]then reconnect wire and when that sets off alarm turn it off in normal way.That should get things back on track.Plus,try replacing the flasher unit,don't know why this works but I've heard of it.
SOURCE: i have 1993 harley softail
Hi, technically i'd have you to to first of all trace the circuit to learn what's causing the problem before contemplating on a new module and using a multi meter to run the test as intended by you is a good idea.
That will determine the condition of the turn signal switch and contacts.
A tip about how the Turn signal works....
The way the turn signals on your bike work is what is known as "Cheap and Nasty".
All the manufacturers do it this way. The resistance in the turn signal circuit is acutally very important to how they work. When you set the indicator switch to turn, you make a contact in the handlebar switch, and this provides either power, or a ground to the indicator relay. This is usually a three terminal device located conveniently where you can't get at it. The relay picks up, and this provides power through the relay coil to both front and rear indicator lamps. (Turn signals for the US residents.) The current drawn by the bulbs in the indicators heats up a bi-metal strip in the relay, and when it gets hot enough, it bends the moving relay contact that is providing power to the bulbs away from the fixed contact and the bulbs go out.
This bi-metal strip then cools down. It contracts and the moving contact makes the circuit with the fixed contact and the bulbs come on again. And so on. So the lights flash. And will continue to do so until you remove the power or gound from the input to the relay.
SOURCE: Turn signals, horn and brake
Not sure of the year of your bike, but if you have an aftermarket alarm system, it is related to the alarm system itself or a bad relay in the circuit.
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