2005 harley_davidson_fxdwg tail light issue

Harley Davidson Wiring Diagrams and Schematics

Hi, Anonymous before diagnosing any brake light issue always check the bulb and fuse first for integrity a brake light staying on is usually caused by the front brake light switch, which is mechanical, not disengaging. In early models moving the throttle control housing closer to the front brake master cylinder is the main fix. On late models, the switch gets tweaked and needs to be realigned. A brake light that does not come on when the brake lever is applied can be caused by a faulty switch or no continuity in the wiring at the switch. The rear brake light switch is hydraulic and it is extremely rare to malfunction in a closed circuit condition causing the brake light to stay on. Usually, rear brake light switch issues are caused by no brake pedal free play or a sticky rear master cylinder piston. A brake light that does not come on when the rear brake pedal is depressed can be caused by a faulty switch, air contamination in the brake line, or no continuity in the wiring at the switch. Finally, most tail light wiring harnesses run under the rear fender held in place by spot-welded clips. Worn out rear shocks or lowered suspension can bottom out causing the rear tire to come in contact with the wiring harness, rubbing the insulation off, exposing the bare metal inner core, allowing it to break or short out.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at [email protected]. Good luck and have a wonderful day.
https://www.hdforums.com/forum/electrical-lighting-alarm/1215381-2010-wideglide-brake-lights-stopped-working.html
http://www.mediafire.com/file/hh3x4sz8742qq26/2010+Harley+Dyna+Service+Manual.pdf
https://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
https://ownersmanuals2.com/harley-davidson/wide-glide-2010-owners-manual-66625
https://www.6ya.com/ to speak to me personally

The brake and running lights should run on separate wires from under the seat, through the hole in the rear fender and into a connector on the rear tail light cover. Your turn signal wires run the same path. These should all be clipped into place under the fender. I would look for a broken wire under the fender, especially at the point of the clip, or a corroded terminal in the tail light housing. The open wires are suseptable to rear wheel thrown road debris. You have easy access for a wire continuity test from the plug under the seat to the tail light cover.

Hi, Joe tail light issues are relatively easy to diagnose and repair always check the tail light fuse first and make sure you have power on both sides of the fuse holder and the usual suspects are:
1. Taillight bulb element is broken.
2. Taillight bulb soldered contacts are extremely worn down.
3. Taillight bulb socket corroded.
4. Taillight bulb socket has no power and or ground.
5. Taillight wiring harness damaged from the rear tire.
6. Taillight rear fender wiring harness connector faulty due to corroded, broken, or loose pins/sockets.
For more information about your issue and valuable "FREE" downloads that you need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at [email protected]. Good luck and have a wonderful day.
https://www.hdforums.com/forum/sportster-models/620758-tail-light-not-working.html
http://www.mediafire.com/file/u6rd3qqr73d2qug/2011_Harley_Dyna_Service_Manual.pdf
https://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
https://ownersmanuals2.com/harley-davidson/wide-glide-2011-owners-manual-66669
https://www.6ya.com/how-6ya-works to speak to me personally.

most likely the filament blew, change the bulb, there are two filaments in the bulb, one for tail light and one for brake.

I would check my wiring

Check your connections. Your ground may have come loose. Your bulbs could be bad. Harleys tend to vibrate alot It is very common for them to shake loose a connection. Your rear bulbs have 2 filaments in them. the tail light will still light up but is the second filament is blown out the brake light will not light up.

Replace the bulb in the tail light. It's dual filament bulb. Brake light is separate from the running light.