[Chuckster]

Now I understand.

I think you have a bad ground connection (high resistance) at the B/W wire. The other lamps are trying to seek ground through the brake light when it is not operating.

To test, just put a jumper wire between the B/W and a good ground and see if you loose the potential that you are seeing on the W/B brake wire. If you do, you need to track down the ground problem or add another ground.

I'm guessing that you are using an LED type test light. I don't think you would get this indication if you used an old incandescent bulb tester. (it take more potential to light up).

Doubtful. The brake light system is LEDs. It shouldn't backfeed like that.

 

[Chuckster]

Talking about black/red/green wires on the engine side of the bike has me convinced there's something else hacked up further up in the system. Here's the factory diagram.

Ignition power to tail light and license light = Brown
Common ground = Black/white
Right signal power = Light Green
Left signal power = Black

Brake light power = White/Black.

 

[rv6john]

Doubtful. The brake light system is LEDs. It shouldn't backfeed like that.

All diodes leak somewhat (Reverse leakage current).

Not knowing what test he is using and what else is done to the bike, it's my best guess.

Grounding the B/W ground wire would answer the question.

 

[Gixfan]

I'm not sure if the PO hacked up any wiring other than under the seat(to install LED taillight). All wiring harnesses that I can visibly see....are factory, and untouched.


When I get home tonight(after 9pm)....I'll post a quick iPhone video of me testing the wires with the test light etc.

Maybe that'll help you better visualize what's going on.

 

[Gixfan]

Not a great video, but hopefully it helps.

 

[Chuckster]

Ok. Let's get my head wrapped around the "jumper" wire scenario.

The wire colors are black, red, green on one side of the connector(engine side of bike) and then change to W/b, Brown, B/w coming out of the tail end of the connector.

What color wire should I be running a "jumper wire" to another known-good ground?

I'm not sure if the PO hacked up any wiring other than under the seat(to install LED taillight). All wiring harnesses that I can visibly see....are factory, and untouched.


When I get home tonight(after 9pm)....I'll post a quick iPhone video of me testing the wires with the test light etc.

Maybe that'll help you better visualize what's going on.

There is no red or green wire in the factory wiring to the tail light..... I'm sure the PO hacked something up... :0001136745-rtfm:

 

[Gixfan]

I think I explained it backward.....the green, red, and black wires are coming from the aftermarket tail light. The W with black tracer....becomes the green wire on the other side of the pigtail. The black with white tracer becomes the solid black wire...and the Brown becomes the red wire.

I unplugged the taillight...and then tested the White with black tracer wire. It works properly when taillight is unplugged! No power to the wire unless I apply brake lever(just as it should be). Does that mean I have a ground problem with the taillight assembly?

 

[Chuckster]

Just means you have a tail light that uses a bit different logic than the stock unit. You could always throw a diode in the brake light feed and put your sensor upstream of the diode. That'd probably be the easiest fix.

 

[Gixfan]

Just means you have a tail light that uses a bit different logic than the stock unit. You could always throw a diode in the brake light feed and put your sensor upstream of the diode. That'd probably be the easiest fix.

That's all Greek to me. Where would I buy a diode....and how is it installed? Is it something I can simply splice in?

How would plugging the taillight assembly into the harness cause the brake light feed to be energized?

 

[Bala]

I unplugged the taillight...and then tested the White with black tracer wire. It works properly when taillight is unplugged! No power to the wire unless I apply brake lever(just as it should be). Does that mean I have a ground problem with the taillight assembly?

Post 6 I told you to do that, as the tail light may be causing the problem.

Post 7 you told me you had and that it made no difference:0001136745-huh:

 

[Gixfan]

Post 6 I told you to do that, as the tail light may be causing the problem.

Post 7 you told me you had and that it made no difference:0001136745-huh:

It's possible that I didnt test if properly when I originally unplugged the pigtail.

Now that I've figured out that the taillight design is the culprit...I need to find a workaround to fix the problem.

 

[Chuckster]

You can buy a diode at RadioShack. Just wire it in line. They are directional though. If it were me, I'd put it on the tail light side of the plug. The diode will keep power from flowing backwards into your transmitter. A diode is basically a one way street in electronics.

RadioShack http://www.radioshack.com/product/index.jsp?productId=12673865&clickid=prod_cs

Crude drawing:

 

[Gixfan]

Safe to assume that I'll have to solder the diode to the wire?

My local Radio Shack has a 3amp diode....is that ok to use?

 

[Chuckster]

3A would probably be enough. Just remember it's on a 12V circuit. Gotta look at what kind of voltage or wattage. Soldering would be the best option.

 

[Gixfan]

Success! Threw on a 3a-400volt diode and now the brake wire is only energized when I apply the brakes.

I VERY POORLY soldered the diode to the wires just to see if it solved my problem(which it did).

Now I need to learn how to solder properly....so this repair is permanent.

 

[Gixfan]

A big THANK YOU....to those who chimed in on this thread and helped me solve it.

The diode is now properly soldered in...and all is working fabulously now.

Make sure to check out the thread I'll be starting later tonight on the helmet brake light. I'll be doing a short video review on how well it works.

 

[lewissampson80]

Help finding brake light wire on '04 GSXR 600

I'm trying to find the wire that goes to my brake light...so I can hook in a wireless transmitter for my wireless helmet brake light.

I have an integrated LED taillight installed(by PO)...and have been using a test light(that pierces the wire insulation) trying to figure out which wire gets energized when I press the front brake lever. I found the blinker wires, but am having no luck finding the brake light wire.

Anyone have any info on this? I suck at electrical stuff.

Help finding brake light wire on '04 GSXR 600

I'm trying to find the wire that goes to my brake light...so I can hook in a wireless transmitter for my wireless helmet brake light.

I have an integrated LED taillight installed(by PO)...and have been using a test light(that pierces the wire insulation) trying to figure out which wire gets energized when I press the front brake lever. I found the blinker wires, but am having no luck finding the brake light wire.

Anyone have any info on this? I suck at electrical stuff.

Light green I not 100 but I'm pretty sure

 

[MadisonMotorsportUK]

9yr old thread.......