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Author Topic: LED turn signal issues 74 cb550  (Read 992 times)

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Offline jamiebridge

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LED turn signal issues 74 cb550
« on: June 19, 2021, 12:22:10 PM »
Hello all, first post.

I have replaced my oem indicators with some motogadget pins.

I have wired them up exactly how the old units came off but im not getting any light from them at all.

I know i need a new relay and a diode to get them working properly, but i thought plugging them directly as the stock ones were i would at least get a solid light or something?

The old ones that came off didnt have a ground wire, im assuming that the ground was the fork shroud. So i plugged the new black grounds into the free ground plug in the headlight. Is there anything i am missing here? All other electrics including rear turn signals are still working fine.

Thanks
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Offline calj737

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Re: LED turn signal issues 74 cb550
« Reply #1 on: June 19, 2021, 01:42:51 PM »
You only need a diode if both light up when one side is selected but both bulbs ignite.

If your headlight bucket is fiberglass, choose a different ground. Maybe use the horn ground location? You don’t disclose where exactly you installed the new Pins, so it’s a bit more difficult to visualize a solution.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline jamiebridge

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Re: LED turn signal issues 74 cb550
« Reply #2 on: June 20, 2021, 01:50:09 AM »
Quote from: calj737 on June 19, 2021, 01:42:51 PM
You only need a diode if both light up when one side is selected but both bulbs ignite.

If your headlight bucket is fiberglass, choose a different ground. Maybe use the horn ground location? You don’t disclose where exactly you installed the new Pins, so it’s a bit more difficult to visualize a solution.

You were spot on. It was a ground issue. Got them both working, put everything back together and now nothing works haha. I think i may have drained the battery as i get the neutral light for about a second and then it dies out. Thanks for your help
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Offline jamiebridge

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Re: LED turn signal issues 74 cb550
« Reply #3 on: June 20, 2021, 02:38:50 AM »
Correction on post above.

Came back to it an hour later with a multimeter, battery measured fine.

Tried indicators. Both perfect. Switched it off, turned it back on… nothing working.

So strange!
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Offline newday777

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Re: LED turn signal issues 74 cb550
« Reply #4 on: June 20, 2021, 03:58:40 AM »
Quote from: jamiebridge on June 20, 2021, 02:38:50 AM
Correction on post above.

Came back to it an hour later with a multimeter, battery measured fine.

Tried indicators. Both perfect. Switched it off, turned it back on… nothing working.

So strange!
Load test the battery. You might have an internal short in the battery.
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A
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