Help please.

Recently bought a black 1992 turbo from the Aberdeen area.

The car had starting issues which I managed to track back to the spade connection on starter and fixed.

I then noticed a wire not connected to the sensor for water temp I think next to it.

Anyway I was charging battery at same time on car.

And checking diagnostics at same time,all fine.

Took charger of car and tried to start.

Nothing, not even a click but a winning noise from the round thing next to battery and the MIL light not appearing ever.

It was there when checking diagnostics but as soon as I turned the key to start car it has dissapeared and the whining noise came and stays on with ignition on.

I am not very technical.

Any help please.

Thanks Rab