Hey guys,

Was reassembling my 2005 Sportster Custom today after getting it painted and in the process I also began to install a new LED tailight that has side flasher capabilities as well. Before testing the new tail light, my rear signals were running lights and signal lights. After using the power from the bikes battery to test the lights, my left signal now works but not the running light part of it. I checked power all along the system, as well as the fuses, and everything is checking out fine it seems. Upon further research, it seems my bike has an HD module that allows the rear signals to be running lights and signal lights. I am wondering if it could be an issue with that module, and if it is, what the replacement part number is for it (I bought this bike with it already on it)...My reasoning is that possibly something happened to it when I tested the blinking part of the light along with the signal also flashing? My right signal works as both running and signal as it should, and my left signal did as well, but now it does not. I wired the new tail light in, but I wired it so that it works just as a brake light and without signals since I couldn't figure out how to have them off and only flash as signals (somehow interrupt the current)

I am going to check the fuses again tomorrow (I am assuming all of the fuses are just above and behind the battery and there are none for the electrical system elsewhere) and just double check to make sure I didn't miss anything, but I am wondering if the module needs to be replaced. I hate electrical gremlins like this, so any help is appreciated.

Thanks!

 

Here is the link to the module. From your description, it is not the fuse. I would double check your install, but these modules do fail occasionally. Check with the maker of the LED tail light - they may not want/need that module there. I would simply remove the module for now and verify the new light functions as intended.

https://www.harley-davidson.com/stor...-11-6946306--1

 

thanks for the reply. Gonna double check everything, but its a cheap light that came with no instructions, although the website mentions nothing about it not being compatible. The light does work, it and the signal/run feature of both sides was working, and then the running light feature of the left side stopped. Im gonna check the fuses and connections as well. The sealed box in the module (which i am assuming is a relay of some kind) looks like its been pinched in one spot, wondering if that caused it.

also wondering if there is a cheaper aftermarket alternative for this module that works just the same

thanks!