« previous next »
Pages: [1]   Go Down

Author Topic: Neutral light not working on 78 CB750  (Read 4323 times)

0 Members and 1 Guest are viewing this topic.

Offline Turbogrimace

  • Hot Shot
  • ***
  • Posts: 387
    • Draft Cycle Works
Neutral light not working on 78 CB750
« on: May 05, 2010, 09:58:42 AM »
It's got a good ground, but it wont light up when it's in neutral.  Could the sensor be bad?  Can it be replaced?
Logged

Offline domer

  • I got a bridge for sale, and it was built by a
  • Expert
  • ****
  • Posts: 902
  • everything is better with a bag of weed!
Re: Neutral light not working on 78 CB750
« Reply #1 on: May 05, 2010, 10:04:45 AM »
stupid q, but did you check the bulb?
Logged

Offline Turbogrimace

  • Hot Shot
  • ***
  • Posts: 387
    • Draft Cycle Works
Re: Neutral light not working on 78 CB750
« Reply #2 on: May 05, 2010, 10:27:29 AM »
LED is bien.
Logged

Offline scondon

  • No way my run was THAT slow, must be an
  • Old Timer
  • ******
  • Posts: 3,137
  • Mmmm......tasty bugs
Re: Neutral light not working on 78 CB750
« Reply #3 on: May 05, 2010, 11:16:04 AM »
The neutral switch is easy to replace. 10mm wrench to remove the retaining bolt, and it should pull right out.

 There is a wire attached to the top of the switch. Try disconnecting this wire and see if your neutral light comes on. I forget how this switch works, but I think that when it's grounded your light goes off. Basically, just confirm that your neutral light does indeed work before going through the hassle and expense of replacing the switch. Could just be a wire unplugged somewhere.
Logged
Give me..a frame to build a bike on, and my imagination will build upon that frame

Offline scottly

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,467
  • Humboldt, AZ
Re: Neutral light not working on 78 CB750
« Reply #4 on: May 05, 2010, 06:20:07 PM »
When the bike is in neutral, the switch grounds, and when in gear, the switch is open. If you connect the light green/red wire that connects to the switch to ground, the light should come on. If it doesn't, the switch is not the problem.
Logged
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline cookindaddy

  • I sure love this bike!
  • Expert
  • ****
  • Posts: 1,153
Re: Neutral light not working on 78 CB750
« Reply #5 on: May 05, 2010, 06:27:12 PM »
Did you say that you are using an LED? Is the polarity correct? LEDs only work with current flow in one direction.
Logged
George with a black 78 CB750K (in Lion's Head, Ontario, Canada)

Offline Turbogrimace

  • Hot Shot
  • ***
  • Posts: 387
    • Draft Cycle Works
Re: Neutral light not working on 78 CB750
« Reply #6 on: May 06, 2010, 11:36:19 AM »
The harness only allows me to put it on one way.  I'll check out out though.
Logged

Offline JLeather

  • Expert
  • ****
  • Posts: 775
Re: Neutral light not working on 78 CB750
« Reply #7 on: May 06, 2010, 11:50:02 AM »
So you've picked a year for that bike then?   ;D
Logged

Offline Turbogrimace

  • Hot Shot
  • ***
  • Posts: 387
    • Draft Cycle Works
Re: Neutral light not working on 78 CB750
« Reply #8 on: May 06, 2010, 12:29:38 PM »
no haha.  It's a 72 with a 78 engine.  Title says 72 and so do I.  ;)
Logged
Pages: [1]   Go Up
« previous next »