Left turn signal fires both rear turn signals and front left signal.

[GRUBBA]

Hi all new to working on bikes just picked up a 1981 Suzuki gs450l and have been putting it back together. Been able to find all my other questions on here but I'm having a odd problem that has stumped me. When the right turn signal is on it fires the right two turn signals while when the left signal is on it fires the front left and both the rear turn signals. They are aftermarket trailer turn signals but I don't think that they are the problem. If anyone has experienced anything like this before I would appreciate some feedback! If there is a thread about this that I have missed please link it.

[Grimly]

Rogue turn signals are commonly caused by a bad ground at one of them.
If they're aftermarket ones, there may be a bad connection or bulb holder in one of them, especially if they're trailer turn signals which I've found are nasty things.

[Eli69]

Also, if they're LEDs that could cause problems.

[GRUBBA]

they are LED any quick fixes??

[Rijko]

How about original blinkers ?
A decent 2nd hand set should not be expensive.

[rphillips]

The only problem I've heard from LED turn signals was blinkers not flashing. I don't want to say it can't happen, just I've not heard of it.

[Rijko]

The only problem I've heard from LED turn signals was blinkers not flashing. I don't want to say it can't happen, just I've not heard of it.

IIRC it's about power from the cockpit indicator lamp.
That's connected to both L/R turn signals.
Not enough to light a regular turn signal lamp but enough for a LED.

Fitting a diode, or disconnecting the cockpit indicator lamp should solve that.

Think there's guys here that can explain this more accurately ..

[rphillips]

Well, my cockpit indicator lamps (instrument turn signal lamps) don't seem to be connected to both L/R turn signals. I think I have one cockpit indicator lamp for the left side and a separate one for the right.

[Rijko]

the GSR hive mind has an interesting topic here ...

https://www.thegsresources.com/_forum/forum/technical-forums/electrical-ignition/59842-led-flashers-what-you-need-to-know

[rphillips]

Yes, I think it says if you have "only one" indicator for turn signals, in your instrument cluster. All the bikes I've had have had one for each side (two total). I can't find it now, but within the last couple weeks, someone here, but in another thread has ordered a flasher for LED's, hoping it will be a Plug N Play for our GS's. Hoping we can find a good one.