The Multi-plug
So now we know the bulb isn't at fault its time to look at the connector itself. The connectors on these lights comprises of four tabs that slot into the multi-plug, these can easily become corroded if water or any liquid gets anywhere near them and can cause problems. With my particular case I noticed there was quite a lot of white corrosion on the multi-plug so I knew this would be a good place to start.
Using some 600 grit sandpaper I ripped a bit off and folded it into a tight card and gave the inside of the multi-plug a quick sanding to clear off any debris or corrosion that could be causing a poor connection.
And then gave it a small squirt of WD40 to clear off anything left from sanding. I let that dry while I turned my attention to the tabs on the cluster that go into the multi-plug.
Give those the same treatment and then wipe away any excess WD40 / electrical contact cleaner ensuring everything is dry before re connecting the cluster.
In my case this fixed my issue. I unplugged the multi-plug once again, reassembled the light cluster and then connected it again before refitting it to the car.
Admire your newfound car maintenance skills, don't pay Halfrauds again!
Remember; This fix wont work in every case but it is somewhere to start, further than this it could be an earthing issue but there are a few threads on earths and grounding points on the fiat forum and obviously anything you cant find i'm sure people on the forum will be more than happy to help.
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