noticed the sidemarkers on ours were not working. Tried looking on line and found that feed is provided by Fiat so that if bulbs etc go they do not flag through the system. Trawling the net looks like relay could have been the fault. Found it at base of drivers b post along with whole bunch of other wires. Concensus was that relay contacts could be corroded due to low current draw of the LED marker lights. I unclipped harness to remove the relay for checking and found an oval button shape connected to one of the wires. This was hidden in the harness. Checking this out the button shape was in fact a cover over a 5 amp fuse. The fuse had gone replaced it and all is well. You might know this but I had no indication anywhere of this fuse on any of the sites I had seen. Hope this helps if others have same issue
Geoff
Geoff