Question about Harley Davidson FXSTB Night Train Motorcycles

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Why does left turn signal turn on and off by itself?

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  • Harley Davidson Expert
  • 125 Answers

Have you recently (before this happened) washed your bike and sprayed (under pressure) your left handlebar switches (or maybe it was out in a really heavy rain)? The reason I say this is that water sometimes gets into your switch and will intermittently make contact. Every time it does it will either turn on or turn off your turn signal. The turn signal works like this: every time you push the switch it sends a +12 volt signal to your TSM (Turn Signal Module). This signal tells the TSM to start flashing the appropriate light (left switch/ left light, right switch/right light). When the switch is triggered the TSM will start counting 20 flashes. If your bike slow below 7 MPH it will pause the count until you start moving 8 MPH or more again. Once it has reached the 20 count it will turn off the signal. Another way it senses to turn off the signal is using the bank angle sensor (built into the TSM). If it senses that you leaned enough to make the turn, it turns off the flasher. Also, if you push the same turn signal switch again (while it is still flashing) it will turn off the turn signal (this is called the "Manual termination). Water in the switch (or a bad switch) can duplicate the condition of pushing the switch on due to vibration. Try hitting the top of your left switch housing a few times, with your hand/fist to simulate the road vibration with the key on, and see if that causes the problem. You could also try disconnection the switches connector to the main harness and see if that prevents the problem from happening. If either test works I would say it is the flasher switch in the handle bar switch housing. You may want to spray so compressed air or WD-40 into the actual switch (have to take the control housing apart to do this). Hope this helps you to find the problem.

Posted on Aug 08, 2016

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  • Harley Davidson Master
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Hi Anonymous, in this scenario I would check the turn signal button first for malfunction and continuity, before diagnosing any turn signal issue make sure the bulb is good and the light fuse has continuity. If no turn signals work the cause could be a faulty turn signal module or the connector going to it, look for corroded, loose, or broken pins/sockets. Contact spray cleaner is great for removing corrosion. If your speedometer does not function properly it will have to be fixed first because your turn signal module gets the data from the speedometer for normal turn signal function. If your front turn signals don't work use a test light to check for power and ground at the bulb socket, then start backtracking the wiring through every wire connector to the turn signal switch/button and check for continuity, go all the way back to the fuse if necessary to find the cause of the malfunction. If your rear turn signals don't work check your rear fender wiring harness connector first for corroded, broken, loose pins/sockets, power, and a good ground, (the harness connector is usually located under the seat on the front of the rear fender) then keep tracing the wiring look for obvious harness damage caused by the rear tire. If you still can't find the malfunction backtrack from the rear fender wiring harness connector. For more information about your issue, please visit the websites below, and for specific information or questions, please feel free to contact me at xlch@mail.com. Good luck and have a nice day.
Harley Davidson Wiring Diagrams and Schematics
Harley Davidson Manuals Mark Workshop

Posted on Sep 26, 2015

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Posted on Jan 02, 2017

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SOURCE: 01 Softail Deuce left turn signal comes on, will not go off

I'm new to this site but actually has fielded a question about a Triumph motorcycle I'm worrking on!

I have an '03 Anniversary Deuce and I ran into (not the exact) but similar problem. My bike has the bars internally wired from the grips all the way through the top triple tree. Somehow over time the turn signal wire got shorted "internally". You might want to just unbolt the turn signal switch from the bars to see if the wire got pinched up high. If not...move the wires around to see if that helps. If it does...ultimately you should re-wire the connections. Just my experience...good luck!

Posted on Feb 10, 2009

  • 3 Answers

SOURCE: 2006 Harley Street Glide turn signal problems

hi, if you have not yet fixed the problem , the fuse box is located underneath the left sidecover in front of the left sattlebag youll need to remove the bag to get the side cover off ck the fuses thats all it should be ,prolly what happened was a bulb went bad and shorted the circut blowing the fuse for them theyre on the same fuse as the tach and speedo

Posted on Apr 27, 2009

  • 1 Answer

SOURCE: turn signal wont turn off by itself

There is NO auto signal cancel device on the Valkyrie. You must set up an auto system in your own head connected to your left thumb.

Posted on Jul 30, 2009

wd4ity
  • 4565 Answers

SOURCE: 1974 Harley Davidson SPORTSTER TURN SIGNAL WIRING

I can help you with the wiring diagram but it will be the complete diagram. I have never seen just a turn signal only type wiring diagram. But, there's nothing to a '74 model Ironhead turn signal system.

All the wires for the system were gray but had these little "colored rubber bands" on the ends of the wires near the signal lights. The violet bands were for the left side and the brown bands were for the right side turn signals

Now, I cannot send the wiring diagram through this forum as it will not allow for an attachment. If you will contact me directly, I'll send you a wiring diagram as a jpeg attachment via e-mail. My address is wd4ity@bellsouth.net.

Good luck
Steve

Posted on Aug 22, 2010

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Turn Signal Lamps
The FRT/TRN/HAZ/CRTSY/MIRR and REAR/TRN/HAZ fuses in the underhood fuse block supplies battery positive voltage to the body control module (BCM). When the turn signal switch is placed in either the left or right position, a signal is sent to the BCM to illuminate the desired turn signal lamps. The BCM has an internal flasher that sends an ON-OFF voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is pressed, a separate ground signal is sent to the BCM to activate and flash all turn signal lamps including both IPC turn indicators. The front and rear turn signals are grounded at G105, G350 and G340. The sound for the turn signal indicators is produced by the IPC.

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2 Answers

Turn signal wont turn off by itself


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