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post #1 of 11 (permalink) Old 03-31-2012, 07:01 PM Thread Starter
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HELP - Wiring Issue

I started my DIY fender eliminator this morning. Things went really well until it came time for wiring the brake light I picked up from Dime City Cycle. There was no wiring diagram provided with the brake light so I had to attempt to figure it out on my own. There were three wires, black, yellow and red. The old wiring harness I pulled from the stock headlight had black, red and blue.

If I looked at the wiring diagram from my manual correctly, black is the ground, red is the tail light and blue is the brake light. I played around with the wiring form the light to the harness and ended up connecting black to black, red to red and yellow to blue.

I found that with this combination the tail light worked, but when I hit the brake light, the other filament didn't light up - I'm assuming that it should have. I then tried black to black, red to blue and yellow to red and this netted the same result. I ended up with the first method; black to black, red to red and yellow to blue.

I connected everything and taped. When I blew two fuses I realized that the heat shrink wrap that I had used didn't fully protect all the metal so I taped everything separately and then re-wrapped the harness.

I got everything ready for a ride, started the bike up and then found that my tail light wouldn't light up. My brake light worked, but that was it. I pulled the wiring apart again and tried black to black, red to blue and yellow to red to no avail. I pushed the bulbholder out from the DCC light and found that yellow was the ground and black and red were connected to the nodes. I rewired my black from the harness to yellow on the light and tried the other positive combinations and still nothing.

Now i was back at ground zero. I ran and grabbed the old light and connected everything back up the way it was when I cut it, black to black, red to red and blue to blue. Even that didn't give me a tail light - only a brake light. I'll post some pictures, hopefully that will help you guys visualize what I'm seeing.

I don't have a clue what is going on? How does the tail light work and then all of a sudden it doesn't? Is it possible I blew the relay or something? I was thinking the relay was for the brake light though, not the tail light. Any help would be appreciated it.
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post #2 of 11 (permalink) Old 03-31-2012, 08:25 PM
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First, check fuse #10. It's for the taillight and parking light and probably got cooked while you were sorting out the wiring. Once that's good to go, try it again the way you had it when the brake light was working.

"Cognito Ergo Wrenchum"
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post #3 of 11 (permalink) Old 03-31-2012, 08:29 PM
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Usually better not to just start connecting stuff. Maybe this can help figure it out. Might wanna look close at the filament. Sounds like you might have started out with a faulty bulb?

https://www.triumphrat.net/twins-talk...ail-light.html

Check Forchetto's post

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post #4 of 11 (permalink) Old 03-31-2012, 08:45 PM Thread Starter
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Thanks for that post. I will double check that tomorrow by placing the wires on the positive terminal. Should I put the ground (of the light) on the negative terminal or the frame? The yellow wire on the light is soldered to the spring on the bulbholder. I'm right in saying that's my ground for the light right?

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post #5 of 11 (permalink) Old 04-01-2012, 07:47 AM
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Yep, that sounds like the ground lead. Connect it to the ground wire on the harness, not the frame. Should be good to go.

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post #6 of 11 (permalink) Old 04-01-2012, 08:46 AM Thread Starter
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There is no ground connected to the frame. The ground is on the spring if the bulbholder. I tried to take a picture....blurry close up of the yellow wire. It worked fine before so why is it bad now?

Unless you're referring to the common ground somewhere in the harness?

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post #7 of 11 (permalink) Old 04-01-2012, 09:09 AM
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My bad. I apologise for that link. I read your post wrong and didn't realise that the light had 3 wires. (reading on my phone) Please disregard that and never listen to me again...

But if you're feeling brave I know that in the wiring harness, all of the black wires are grounds, 2 for signals, one for brake

Have you tried finding a schematic for the light on the manufacturer's website? You didn't mention the type of light you have. Post and maybe another member has had the same problem?

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Last edited by Bron-Yr-Aur; 04-01-2012 at 09:22 AM.
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post #8 of 11 (permalink) Old 04-03-2012, 11:50 PM
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I am having the same issue with an after market tail light.
If I come up with a solution before anyone else does, I'll post it here.
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post #9 of 11 (permalink) Old 04-04-2012, 11:26 AM Thread Starter
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Monk,

I have to admit that my issue was.completely stupid. I was looking at my haynes manual and read blinkers and brake light and just assumed that it was my tail light too. Didn't realize that position meant brake light. Popped in a new fuse and was good to go!

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post #10 of 11 (permalink) Old 04-08-2012, 09:54 PM
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I got mine working. Thanks for all your help.


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