Folks I want to make a finishing statement for this thread. SoCal started this thread with a question about turns signals intermittently failing to flash. Contacting TricLEDs directly, he was sent new switchback modules, one for both sides. Replacing the Module fixed his turn signal failure condition for turn signal operation. We thought everything was over and we could close the thread with a complete solution.
Then, along came mpj220 . He described a totally different Turn Signal System Failure. He had installed Aux LED lights on his front spoiler to flash with his turn signals. All worked fine. The he discovered, when stopped and with the Emergency Flashers activated and the ignition key off, he got only one blink and all stopped, no more flashing. With the key in the on position, his Emergency Flashers work fine along with all his other Aux LEDs on the front Spoiler.
After reading our thread about adding a 2 watt 100 Ohm resistor, he installed the resistor in the signal line. He reported now his Emergency Flashers are working.
SoCal, tried his Emergency Flashers with the ignition key off and reported it failed. He installed the resistor and has reported that his entire Turn Signal System is all working correctly, after installing the 2 watt 100 Ohm resistor to his turn signal leads and the Aux LEDs.
Now I had an even different condition of turn signal system failure. I installed LED Monitor lights on my rear view mirror. I connected them to the turn signal leads and tested them out. With the key on and engine not running, all turn signal lights flashed perfectly, along with my Aux Monitor LEDs. Then I went to take a test ride. When I activated the turn signals, they fashed one time and quit. No more flash.
I knew from Ohm Law that the problem was when you add additional lighting, you increase the current. After investigating the Flasher Modules for the Slingshot, I found it makes a check for current limits for the turn signal lights. If too much is flowing it will shut it down and alert you that something is wrong.
So, the way you lower current is to add resistance to the lead and you will get it back to limits and the flasher will work. The LEDs have a wire range of current and voltage operation where they will work. That is why adding just a little resistance will correct the problem.
Now, if you have added anything to your turn signal leads, you need to check your emergency flashers with the key off to see if they work. If they don't and everything else flashes right, add the resistor. If anything fails, add the resistor. The resistor will fix any turn signal failure after installing any aux leds to the turn signal system.
Adding lighting to any other lighting system in the Slingshot will not need the resistor, the Flasher Module on the turn signal circuit needs the resistor to lower current. Want to make that clear. Only the turn signal system require this mod when adding LED light.
Good luck to all, over and out on this subject.