Jump to content

Diode Resistance


Recommended Posts

I'm having a problem with my motorbike not starting. The troubleshooting guide in the service manual asks me to check continuity on the neutral diode, saying there should be a 'small resistance' between the terminals, with the diode out of the circuit (no voltage).


I've measured 750 ohms - is that considered 'small' or is it broken?

Link to comment
Share on other sites

  • 2 weeks later...

Are you testing using the "diode" setting on your meter?


If so, that could be reading the 0.75 volt drop that is normal for a diode. A diode acts like an open circuit when the wrong way round in your circuit and a short circuit when the right way round. If you place a low watt lamp and diode in a series circuit from your battery, most of the battery voltage will appear across the lamp with a small 0.7 volt drop across the diode.


Hope that helps? (It's late and I should be in bed !)



Link to comment
Share on other sites

I was measuring resistance, not voltage. Turns out that 750 ohms was fine (according to Honda mechanic at the dealer). I put the diode back in, wiggled a few more connectors and suddenly it fired up - must have been a dodgy connection somewhere... :search:

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...