Modern Vespa

Hi there,

I am a 2016 model vespa GTS 250 i.e owner. I bought it secondhand last year. Last Friday when I was about to go to TUV test on the morning, when I had started the engine, I had noticed that rear left signal is not blinking. I removed lamp, checked the bulb, it is working. Controlled the Wiring till the rear socket with a multimeter. Everything is fine, lamp is OK. Cable is OK. however, signal is not blinking. Front signal is Functioning normally. without going into too much detail. I would like to ask what the reason can be ? the day before, Thursday night, I had charged the grounded battery By removing it and connecting it to noco genius 5. Everything was functioning at the middle of the night. I was not driving it since six months. Can anybody tell me what to look for ?

The rear left signal is not blinking, but is it staying on or off?

Have you checked the blinker fluid?

Nothing. No signals of life.

I cought the sparks in the bucket

Is there corrosion in the bulb socket?
Are you sure the bulb is good?

No sign of corrosion. Checked it with multimeter also. I changed the bulb with a new one.

So with the multimeter on DC volts and testing at the socket, you can see voltage alternating between +12V and 0V ("blinking")?

EDIT: Without a bulb in the circuit there may not be enough load on the flasher relay to cause the voltage to "blink". Is there at least a solid +12V at the socket?

How about the Ground (or earth)? Is there continuity from the socket to the battery (-) terminal?

are you sure it's the correct bulb? maybe try swapping with the bulb from the rear right signal?

I did. No sign of life. Correct bulb.

I was able to check it now. All dead

It looks like you have a broken wire. Hope this wiring diagram helps you trace it. Good luck!

https://manuals.wotmeworry.org.uk/Vespa/GTS250/GTS250%20Wiring%20Diagram.pdf

Edit: I'd double check the switch and the bulb, and then check them again. These would be much easier to replace than tracing a broken wire.

Oh ! All right. I need to postpone the test date thanks for everything. I will check the switch, too.

OK, so no current going to the rear left blinker.

There is only 1 explanation: there is an interruption in the wiring somewhere.

Earlier you wrote:
"Controlled the Wiring till the rear socket with a multimeter."

What section of the wiring exactly did you check? Did you check it all the way down to the turn indicator device?