Question about Harley Davidson FXSTB Night Train Motorcycles
Posted by Anonymous on
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
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 email@example.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
SOURCE: turn signal wiring
Try the above link, good luck.
Posted on Nov 12, 2008
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
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
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 firstname.lastname@example.org.
Posted on Aug 22, 2010
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