Lights on my gsx1400 flash when indicators on

I would think its a flasher relay or switch problem, do the indicators work when used via the stalk switch ? if they do then I'd start with the hazard switch

Only the bulb is linked with those seperate items the bulb runs both blinker and hazard normally one goes both go when u have tufrn signal on inside if u hear it flashing fast its ur bulb

Generally speaking, symptoms of a bad or failing turn signal bulb are usually the culprit...in your case, either it's the front left or rear bulb. Varies for different vehicle makes...common signs include:

1. turn signal light staying on solid
2. or blinking very fast
3. or either sides of the bulbs stop blinking altogether.

To test this, make sure you reconnect everything you disconnected.
Turn the left signal light on; go to the front of the vehicle, is the turn signal bulb illuminated? If it lights up, even though it is not blinking obviously the bulb is okay. If it doesn't, replace it- problem solved. You'll do the same procedure for the rear turn signal Is that lit up? If not replace the bulb and the problem is solved.
Another common failure is when the turn signal blinks really fast, same procedure as mentioned above.
If both bulbs for the left side and right side illuminate but don't blink, the problem is in the steering column turn signal switch.
If the left or right side blinkers don't work properly at all...then check the integrated hazard warning/turn signal flasher relay- that may be defective; again, that's usually the case if both sides of the signal light don't work.
If you are blowing any fuses related to the flasher system, you have an electrical overload in the turn signal circuitry.

flasher relay under steering column does not work,switched it with hazard and see if it works,then get the new one,make sure the light on turn signal in front or back is not burned out first

I suspect that the problem is in the indicator switch and not the lights. To prove this press the hazard lights and if all lights flash it is not the lights or circuits./he indicator unit just flashes and the power is directed to each side depending on where the indicator switch is positioned . If one side flashes first and repositioned to the other side and it won't work then it indicates a switch fault and not bulbs.

blinking fast indicates a bad bulb on that side. try front and back bulbs

did you change the battery ? wrong amps or voltage could do that sometimes. it's called reverse polarity.

try running a new ground to the left socket,

Find the ground wire on one of the lights and add another ground wire to a good clean metal surface and see if that fixes the problem. It defently sounds like a ground problem at one of the lights.