boboneleg Posted October 3, 2023 Share Posted October 3, 2023 The headlight on my new (to me) Yamaha doesn't work (side light is fine) .There is no power at the bulb connector and then I traced to wiring to the fuse box and there is no power there. I suspect it might be the relay at fault as I have power going in and as far as I can tell none coming out. This is the (possible) culprit and Yamaha would like £83.42 for a new one . So could I just use something like this .................... https://www.amazon.co.uk/Ehdis-12VDC-Multi-Purpose-Relay-Standard/dp/B01JBRHG7M/ref=sr_1_1_sspa?crid=1TYQMG92C88A1&keywords=motorcycle%2Bheadlight%2Brelay&qid=1696353837&sprefix=motorcycle%2Bheadlight%2Brelay%2Caps%2C119&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1 2 Link to comment Share on other sites More sharing options...
XTreme Posted October 3, 2023 Share Posted October 3, 2023 4 Link to comment Share on other sites More sharing options...
Buckster Posted October 3, 2023 Share Posted October 3, 2023 There should be no issue as long as the connections are in the same format on both relays, relays are basic devices. 2 Link to comment Share on other sites More sharing options...
Catteeclan Posted October 3, 2023 Share Posted October 3, 2023 "There is no power at the bulb connector and then I traced to wiring to the fuse box and there is no power there. I suspect it might be the relay at fault as I have power going in and as far as I can tell none coming out" . You should be able to bridge 30 and 87 to get the light on. The other 2 should give you vehicle voltage with the bike running. 4 Link to comment Share on other sites More sharing options...
busabeast Posted October 3, 2023 Share Posted October 3, 2023 1 hour ago, boboneleg said: The headlight on my new (to me) Yamaha doesn't work (side light is fine) .There is no power at the bulb connector and then I traced to wiring to the fuse box and there is no power there. I suspect it might be the relay at fault as I have power going in and as far as I can tell none coming out. This is the (possible) culprit and Yamaha would like £83.42 for a new one . So could I just use something like this .................... https://www.amazon.co.uk/Ehdis-12VDC-Multi-Purpose-Relay-Standard/dp/B01JBRHG7M/ref=sr_1_1_sspa?crid=1TYQMG92C88A1&keywords=motorcycle%2Bheadlight%2Brelay&qid=1696353837&sprefix=motorcycle%2Bheadlight%2Brelay%2Caps%2C119&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1 3 Link to comment Share on other sites More sharing options...
boboneleg Posted October 3, 2023 Author Share Posted October 3, 2023 3 hours ago, Buckster said: There should be no issue as long as the connections are in the same format on both relays, relays are basic devices. That's what I was hoping , I just wondered if there was any trickery going on inside them . Link to comment Share on other sites More sharing options...
boboneleg Posted October 3, 2023 Author Share Posted October 3, 2023 2 hours ago, Catteeclan said: "There is no power at the bulb connector and then I traced to wiring to the fuse box and there is no power there. I suspect it might be the relay at fault as I have power going in and as far as I can tell none coming out" . You should be able to bridge 30 and 87 to get the light on. The other 2 should give you vehicle voltage with the bike running. I put my meter across 85 and 86 and got no reading at all , from that I presumed the relay was dead ? I'll try what you said tomorrow 1 Link to comment Share on other sites More sharing options...
Sir Fallsalot Posted October 3, 2023 Share Posted October 3, 2023 3 minutes ago, boboneleg said: That's what I was hoping , I just wondered if there was any trickery going on inside them . This is a common relay wiring. 85 and 86 are the coil. 30 and 87 are your switch on this particular relay 3 Link to comment Share on other sites More sharing options...
Pedro Posted October 3, 2023 Share Posted October 3, 2023 2 hours ago, Catteeclan said: You should be able to bridge 30 and 87 to get the light on. The other 2 should give you vehicle voltage with the bike running. I love it when people say shit like that. Still doesn't mean shit to me, but it feels like you're Gandalf talking magic that you simply know from ages of experience. 1 5 Link to comment Share on other sites More sharing options...
Pedro Posted October 3, 2023 Share Posted October 3, 2023 10 minutes ago, Sir Fallsalot said: This is a common relay wiring. 85 and 86 are the coil. 30 and 87 are your switch on this particular relay Yes, the coil! 1 Link to comment Share on other sites More sharing options...
Sir Fallsalot Posted October 3, 2023 Share Posted October 3, 2023 1 minute ago, Pedro said: Yes, the coil! There to stop the relay getting pregnant 3 Link to comment Share on other sites More sharing options...
Pedro Posted October 3, 2023 Share Posted October 3, 2023 18 minutes ago, Sir Fallsalot said: There to stop the relay getting pregnant I could have used you as an electrics teacher. So the coil is a condom. 5 Link to comment Share on other sites More sharing options...
busabeast Posted October 4, 2023 Share Posted October 4, 2023 5 hours ago, Sir Fallsalot said: This is a common relay wiring. 85 and 86 are the coil. 30 and 87 are your switch on this particular relay 2 Link to comment Share on other sites More sharing options...
Catteeclan Posted October 4, 2023 Share Posted October 4, 2023 8 hours ago, boboneleg said: I put my meter across 85 and 86 and got no reading at all , from that I presumed the relay was dead ? I'll try what you said tomorrow Yes, you should have resistance between them so you're prob spot on. 1 Link to comment Share on other sites More sharing options...
boboneleg Posted October 4, 2023 Author Share Posted October 4, 2023 8 hours ago, Pedro said: I could have used you as an electrics teacher. So the coil is a condom. Not quite, if it’s got a coil it doesn’t need a condom 4 Link to comment Share on other sites More sharing options...
Buckster Posted October 4, 2023 Share Posted October 4, 2023 9 hours ago, boboneleg said: I put my meter across 85 and 86 and got no reading at all , from that I presumed the relay was dead ? I'll try what you said tomorrow You would only get a reading between 85 and 86 if the light switch was on. Link to comment Share on other sites More sharing options...
boboneleg Posted October 4, 2023 Author Share Posted October 4, 2023 1 hour ago, Buckster said: You would only get a reading between 85 and 86 if the light switch was on. It's hard wired Ian Link to comment Share on other sites More sharing options...
boboneleg Posted October 4, 2023 Author Share Posted October 4, 2023 And lo I did spring forth to the work place this morning and a Ducati part did magically appear and there was much excitement and jollity 4 3 Link to comment Share on other sites More sharing options...
Pedro Posted October 4, 2023 Share Posted October 4, 2023 3 hours ago, boboneleg said: Not quite, if it’s got a coil it doesn’t need a condom See? I'm no good at electrics 4 Link to comment Share on other sites More sharing options...
boboneleg Posted October 4, 2023 Author Share Posted October 4, 2023 and....................... the headlight works again 6 Link to comment Share on other sites More sharing options...
Pedro Posted October 4, 2023 Share Posted October 4, 2023 2 Link to comment Share on other sites More sharing options...
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