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post #1 of 18 (permalink) Old 07-25-2016, 08:20 AM Thread Starter
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Wiring question.

Hi All,

As part of putting my bike together again i am encountering some issue with my undertail install. Looks like the rear wiring harness has been tampered with. I have Subsailors writeup on wiring and also the wiring diagram (i suck at any thing electrical) anyhow i am attaching a couple of pictures.

Bestem undertail has four wires per light plus i have added a led license plate light. Black and Grey wires.

Undertail:
Black = Ground
Yellow = Running
Red = Break
Blue = Turn

License Plate light:
Black = Ground
Grey = Running light

As you see from the pictures i have three connections from each side.

Green = Ground
Brown =
Green and Yellow = Turn

Inputs please....Many thanks for your help.

Pictures here

Last edited by Vnaik; 07-25-2016 at 08:26 AM. Reason: Post pics
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post #2 of 18 (permalink) Old 07-25-2016, 02:29 PM
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On the OEM harness, the following color codes are:

Black/Brown = Tail Light and License Plate Light (both at same point electrically)
Green = Ground

Green/Yellow = Brake lights
Green = Ground

Orange = Right Signal
Green = Ground

Light Blue = Left Signal
Green = Ground

Match the OEM wire colors to the equivalent Bestem colors and test.
For the signals, you will need to find which wire goes to which signal as Bestem in the past used the same color for each signal regardless of Left or Right.

Don't use splices to lash it together. Use solder and heat shrink tubing.
Also, for servicing, try to find a suitable electrical connector with enough contacts so you can easily remove the undertail if need be (easily done if an electronics supplier is available).

I say this because the prior owner to my bike hard-wired the upper cowl to the harness, which made for interesting times (and much cussing) when I went to remove it.
And made a simple job complex.
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post #3 of 18 (permalink) Old 07-25-2016, 02:50 PM Thread Starter
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Quote:
Originally Posted by SubSailor View Post
On the OEM harness, the following color codes are:

Black/Brown = Tail Light and License Plate Light (both at same point electrically)
Green = Ground

Green/Yellow = Brake lights
Green = Ground

Orange = Right Signal
Green = Ground

Light Blue = Left Signal
Green = Ground

Match the OEM wire colors to the equivalent Bestem colors and test.
For the signals, you will need to find which wire goes to which signal as Bestem in the past used the same color for each signal regardless of Left or Right.

Don't use splices to lash it together. Use solder and heat shrink tubing.
Also, for servicing, try to find a suitable electrical connector with enough contacts so you can easily remove the undertail if need be (easily done if an electronics supplier is available).

I say this because the prior owner to my bike hard-wired the upper cowl to the harness, which made for interesting times (and much cussing) when I went to remove it.
And made a simple job complex.
Thank you sir!!!! willupdate
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post #4 of 18 (permalink) Old 09-27-2016, 03:40 AM Thread Starter
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Ok so i have tried all the suggestions from here. I did a little video to show what the issue is can you please take a look and recommend if not she goes to the stealership to get sorted Dropbox link here thanks Guys
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post #5 of 18 (permalink) Old 09-27-2016, 03:59 AM
bpw
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Green w/yellow from tail light goes to bestem red, black w/yellow from tail light goes to bestem blue, solid green from tail light and solid green from turn signal both go to bestem black orange from turn signal goes to bestem yellow. That's the best I could describe it, that is the left side. Right side, turn signal blue to bestem yellow the rest is the same as the left but from the right tail light. The tag light is pretty straight forward. Green is ground black w/brown? Stripe is power.
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post #6 of 18 (permalink) Old 09-27-2016, 05:57 AM Thread Starter
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Thank BPW! Even when your turn signals are not connected should the display show if your turn signal switch is engaged?
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post #7 of 18 (permalink) Old 09-27-2016, 04:47 PM
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if neither front nor back is connected no, if only the front or back is connected it will "fast flash" if both front and back are connected it will do the normal flash interval.
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post #8 of 18 (permalink) Old 09-28-2016, 05:01 AM Thread Starter
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Quote:
Originally Posted by bpw View Post
if neither front nor back is connected no, if only the front or back is connected it will "fast flash" if both front and back are connected it will do the normal flash interval.
Thank you Sir!!!! Between you and Sub Sailor i think i may have saved some money and gained a lot of knowledge. Thank you!!!!
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post #9 of 18 (permalink) Old 09-28-2016, 05:12 AM
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That's great. I hate wasting money, this forum has been good to me also.
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post #10 of 18 (permalink) Old 10-08-2016, 03:35 PM
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Quote:
Originally Posted by SubSailor View Post
On the OEM harness, the following color codes are:

Black/Brown = Tail Light and License Plate Light (both at same point electrically)
Green = Ground

Green/Yellow = Brake lights
Green = Ground

Orange = Right Signal
Green = Ground

Light Blue = Left Signal
Green = Ground

Match the OEM wire colors to the equivalent Bestem colors and test.
For the signals, you will need to find which wire goes to which signal as Bestem in the past used the same color for each signal regardless of Left or Right.

Don't use splices to lash it together. Use solder and heat shrink tubing.
Also, for servicing, try to find a suitable electrical connector with enough contacts so you can easily remove the undertail if need be (easily done if an electronics supplier is available).

I say this because the prior owner to my bike hard-wired the upper cowl to the harness, which made for interesting times (and much cussing) when I went to remove it.
And made a simple job complex.
hey guys
was looking at this and gonna thread jack this diagram
im in the middle of fitting my hotbodies undertail.
I've connected almost everything but where does the green wire off the turn signal go?
I've connected the other 3 wires which made sense but this one.
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