Maybe instead of finding the wire at the stalk you could splice into the live on the indicator bulb on one of the front wings? Easy enough to get to by removing the wheel and arch liner, you'd need to feed a wire into the cabin through one of the grommets in the engine bay.

If you choose to go for the wiring and tapping into front wing wires which would be easiest way as Mark said above you may well find yourself having the bulb failure message appearing on the dash, due to the extra load on the circuit when the buzzer operates.
Though the only way to find out would be to wire it up with the length of wire you intend to use and test before routing the wire into the cabin area.

why dont you just pay attention that the indicator is still flashing after turning it on to turn it off?

Stilatos said:

why dont you just pay attention that the indicator is still flashing after turning it on to turn it off?

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:yeahthat:

Although fair play to the chappy for actually having the manners to use the indicators there are far too many folk in these parts that seem to find the action of moving the indicator stalk a very exhausting experience, along with having no brain cells to understand the use of their mirrors, perhaps they should be classed as an option when buying the car but hey do not go giving them ideas on that..anyways if the man needs something buzzing in his cabin I hope he enjoys his ride...

Stilatos said:

why dont you just pay attention that the indicator is still flashing after turning it on to turn it off?

Click to expand...

As he's already mentioned, and what he doesn't want us to mention, is that he's getting old

Provided a nice tone and volume of buzzer is chosen I think this could be a nice feature, even for the youngsters out there who play their tunes a bit loud

Doesn't really answer the question, but I believe if you remove the plastic shield that sits above your feet over the pedals, it allows more sound from the indicator 'clicker' to enter the passenger compartment. So you might then be able to hear it more easily.

Just a thought...

Best idea I have is to get a 7 way bypass towbar relay and 2x led trailer resistor "ballasts". Wire to a switched live to relay tap into both rear light cluster indicator wires as per towbar fitting instructions put the 2 ballasts on the indicator output side of the relay see the Grande punto guided for. My towbar electric guide