Question about Harley Davidson FXSTS Springer Softail Motorcycles

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I have 1993 harley softail springer the turn signals don't work. i have the ignition is on lights , i then depress the left or right turn signal switch and all start to blink like there on hazard even the headlight blinks. sometimes i'll hear a low click noise and the lights wont work at all. place the ignition on accessory and depress the left or right turn signal switch all turn signals front left and right and rear left and right blink this is the hazard it works fine. do you thin i need a new module i still need to run a multi meter on it is see if the a bad ground somewhere. just need another opinion before i tear into it i mite be overlooking the obvious

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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.

Posted on Oct 05, 2010

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