Day Running Lights, conundrum !

[MykCamper]

Here's one that is driving me Mad!
Fiat Ducato 2013, Day Running Lights, (DRL) R/H bank of 5 not working, middle bulb has not worked for 3 years, now non work at all. But when I swop the units around they are all illuminated, except for the one bulb that's been out on the R/H Bank.
Checked the connectors, like new, smeared both with petroleum jelly to no Avail!
Any thoughts would be much appreciated!

 

[witzend]

Any help here ?

 

[Mr and Mrs Tupcox]

Sounds like a wire problem Mike I had it on our old swift year's back in the end I run a new neutral wire was fine then.
Sounds like the one that's out all the time is where the neutral fault is .possibly.