Technical 500 1.2 starter issue

[Fishlover]

Please HELP!!

Replaced the starter 3 times and the car has the same problem. There is a noise from the starter when you turn the key to start the car. Also replaced the ground cable under the starter battery, but the problem persists. The starter battery is good.

Replaced the flywheel. No fault codes. To ensure that there is nothing wrong with the starter, I have installed a loose cable from the signal on the starter to the starter battery and it starts without a noise every time I connect the cable to the positive pole directly. Starts with a cable without problems. Start with the key, the noise comes. Also checked the relay for the starter and do not suspect that the problem is there.
Usually happens when it is cold.
The noise does not come every time you turn the key, usually disappears when the car is warm.

 

[John202020]

Sounds like the start signal wire cannot supply enough current, the thin one, check the relay to fuse box contacts but it's likely there's a failing point somewhere in the cable possibly right at the end?

 

[Fishlover]

Sounds like the start signal wire cannot supply enough current, the thin one, check the relay to fuse box contacts but it's likely there's a failing point somewhere in the cable possibly right at the end?

I have checked the relay and can't find anything wrong with it. I have also replaced the relay with a similar one but the problem remains. I suspect that the signal cable is faulty but there is a semi-automatic gearbox on the car and the signal cable goes through the gearbox and then to the starter motor and I can't access the electrical circuit on the car.