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I have an 09 Road King with dealer-installed HD accessory LEDs all around. Problem is, the right rear turn signals stops flashing when brakes are applied. When brakes are applied, that location lights up as a brake light only, but doesnt flash. As soon as brakes are released, it resumes flashing appropriately.
Any thoughts on where I should start looking? Appreciate any help.
I took a look at the wiring harness under the seat, and also disassembled the rear taillights. Looked over everything carefully and didn’t see anything that looked bad. No noticeable broken wires, no wires touching each other or grounding out.
Now I’m wondering if a bad taillight circuit board could cause this.
Always try the simplest route, first. Sounds to me they may have connected some wires incorrectly.
You can always go to the Harley website and look at the instructions for the parts you had installed, particularly wiring, and go back and check their work to make sure it was connected correctly.
as an example, if they connected the purple wires to the brown wires in a harness, something is not going to work right.
Also, there is usually a procedure in the instructions on how to sync your BCM after installing LED's. Usually something as turning on your four ways with the ignition on, and then off.
Lastly, check the wiring as it comes from under the saddle, along the fender and into the lights. May be a wire rubbed or something. Electrical problems are the most frustrating, IMO.
Oh, and Imagine....a dealer not doing something correctly.....shocking.......
@bamorris2 Did everything work OK after the new lights were added? What was added, not sure if you mean turn signal and brake lights or something else. "HD accessory LED’s"
Did you look under the fender to see if the wiring harness is damaged?
If the blinker is not on does the Rt turn signal light up with brake light?
To answer a few questions.
1. I did in-fact look up the install instructions from HD. Everything is wired correctly. There is no mention of any PCM/BCM programming required.
2. I do not know if everything worked correctly when initially installed. It was done by the dealer when the previous owner purchased it back in 2009.
3. Without turn signal being on, the right brake light works as intended.
To answer a few questions.
1. I did in-fact look up the install instructions from HD. Everything is wired correctly. There is no mention of any PCM/BCM programming required.
2. I do not know if everything worked correctly when initially installed. It was done by the dealer when the previous owner purchased it back in 2009.
3. Without turn signal being on, the right brake light works as intended.
By any chance do you have the run/brake/signal light module in there. It's simply a group of diodes that limit one way current.
My bike and truck has one. Even my old 93 jeep which was pre high brake light requirement.
It stops feedback from the brake and signal going back when they are used. If a diode burns out shorted, it will do that.
It's a 1.5 square cube with pigtails coupled in, usually under the seat in line with taillight harness.
Looking at the schematic, both the turn signal and brake can have 12V on at the same time. This makes me think that there is a small circuit board in the light that controls the brake light when the turn signal is on.
Can you swap plugs, #4, for the right and left and see if the problem follows?
Looking at the schematic, both the turn signal and brake can have 12V on at the same time. This makes me think that there is a small circuit board in the light that controls the brake light when the turn signal is on.
Can you swap plugs, #4, for the right and left and see if the problem follows?
Thats a great idea! If I swap the connectors, and the problem persists with the right light (via activating the left turn switch), then that would mean the light itself is bad. And yes, there is a circuit board in the light housing that two wires are connected to.
Thats a great idea! If I swap the connectors, and the problem persists with the right light (via activating the left turn switch), then that would mean the light itself is bad. And yes, there is a circuit board in the light housing that two wires are connected to.
The light is defective. As suggested, I swapped all of the connectors for the left and right lights, and the problem remained with the same light. So it is 100% the LED light. I dont see any issue with the wiring, so it could be the circuit board. Ill have to order another set of lights.
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Turn signal issue
