« previous next »
Pages: [1]   Go Down

Author Topic: tail light  (Read 1397 times)

0 Members and 1 Guest are viewing this topic.

Offline Ryan6838

  • Hot Shot
  • ***
  • Posts: 266
tail light
« on: June 09, 2010, 06:39:22 PM »
Ok so i got a led lucas tail light to put on my bike that im rebuilding. Im having trouble with the wiring.What wires connect its got a yellow red and black. I tryed afew diff way i got red to green/yellow and got brake light to work and black as ground and yellow to brown but i dont get a running light. Any help guys?
Logged
1978 cb750k

Offline xenoscr

  • Enthusiast
  • **
  • Posts: 152
  • 1975 Honda CB750 K5
Re: tail light
« Reply #1 on: June 09, 2010, 06:44:04 PM »
What bike. On a 750:

Green = Ground
Green/Yellow = Stop Switch
Brown = Power/Running Light

XeNoSCR
Logged
1975 Honda CB750 K5

Offline Ryan6838

  • Hot Shot
  • ***
  • Posts: 266
Re: tail light
« Reply #2 on: June 09, 2010, 06:47:33 PM »
sorry cb750 78 and i think the wiring's right but no running light.
Logged
1978 cb750k

Offline xenoscr

  • Enthusiast
  • **
  • Posts: 152
  • 1975 Honda CB750 K5
Re: tail light
« Reply #3 on: June 09, 2010, 07:00:27 PM »
I would try the following:

Black -> Green
Red -> Brown
Yellow -> Green/Yellow

Or try swapping the brown and Green/Yellow around. That's assuming Black is supposed to be the ground on your new tail light.

XeNoSCR
Logged
1975 Honda CB750 K5

Offline OldSchool_IsCool

  • Really feeling like an
  • Old Timer
  • ******
  • Posts: 4,349
  • WARNING: Objects in mirror appear to be LOSING!
Re: tail light
« Reply #4 on: June 09, 2010, 07:02:10 PM »
Is this the light?

http://www.britcycle.com/products/led/391_53454_LED.htm

If so, there are installation instructions on that page.
Logged
Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lot’s of things. You’ve been watching me.
Will you show me all of them?
Sure.
Is it hard?
Not if you have the right attitudes. It’s having the right attitudes that’s hard.

Offline Ryan6838

  • Hot Shot
  • ***
  • Posts: 266
Re: tail light
« Reply #5 on: June 09, 2010, 07:04:34 PM »
Now its a random ebay light and it dont have instructions.
Logged
1978 cb750k

Offline xenoscr

  • Enthusiast
  • **
  • Posts: 152
  • 1975 Honda CB750 K5
Re: tail light
« Reply #6 on: June 09, 2010, 07:07:59 PM »
Is there any writing on the circuit board?

XeNoSCR
Logged
1975 Honda CB750 K5

Offline Spanner 1

  • Old Timer
  • ******
  • Posts: 4,092
  • CB 750 K0 ( always thought it was a K1!) + CB750K8
Re: tail light
« Reply #7 on: June 09, 2010, 07:18:01 PM »
+1 with zen... British stuff ( Lucas) use Black as ground ( the opposite of our bikes where Black is always +12v , or whatever your battery is reading )..... another Brit 'opposite' example..... in merry 'ol England a Mars bar = a Milky Way, shock horror!!!
Logged
If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Offline Ryan6838

  • Hot Shot
  • ***
  • Posts: 266
Re: tail light
« Reply #8 on: June 09, 2010, 07:54:13 PM »
Ok its a wiring problem up in the headlight bucket. i have a left over wire ( i know im a noob) its a short 3in brown/blue wire with a little yellow tag and black tag on the ends. I tryed connecting it from black to brown or black to brown/white and i got power to my running light and the gauge lights started working but then the turn signals stopped flashing. Im a little lost here some sohc guru save me.
Logged
1978 cb750k

Offline xenoscr

  • Enthusiast
  • **
  • Posts: 152
  • 1975 Honda CB750 K5
Re: tail light
« Reply #9 on: June 09, 2010, 08:14:26 PM »
From the "Download Motorcycle Manuals" section:

http://www.mediafire.com/?wqzmehqvkzl

Check out page 272 of the PDF (279 is printed page number) It's a wiring diagram for the 78 CB750. It should help you track down your issue.

XeNoSCR
Logged
1975 Honda CB750 K5

Offline Ryan6838

  • Hot Shot
  • ***
  • Posts: 266
Re: tail light
« Reply #10 on: June 09, 2010, 08:49:29 PM »
figured it out turn buzzer wire was crossed all good now. ;D thanks for the help guys
Logged
1978 cb750k
Pages: [1]   Go Up
« previous next »