LED puzzle

[Figaro]

Inspired by Northernraider I decided to replace my front side lights with led.
I bought some from his link and fitted this week.
O/S no problem, N/S didn't work so I put the old bulb back in and that worked.
Faulty led I concluded.
Later I tried the non working led directly on a bench battery and it worked.
So I removed the bulb holder from light fitting cleaned up the terminals put the led in connected to bench battery and it worked.
I put it all back together in vehicle and guess what, not working (except when I put original bulb back in)
Swopped led over from O/S, nothing.
Anyone know what I'm missing ?
Could it be the led's are somehow incompatible with vehicle ?
2003 ducato.
TIA

 

[Northernraider]

That's weird. ... can't see how they can be incompatible as only a year older than mine and mine are fine.

Great thing about these vans is they don't have all the canbus issues of the 2007 onwards models

 

[SandraL]

Could it be the wires reversed on vehicle wiring? Normal bulb wont care but led needs correct polarity

 

[grasscutter]

Could the polarity be reversed on the non working side.
The current only flows through in one direction unlike a halogen bulb.
SandraL obviously types faster than me

 

[Figaro]

I'll try reversing the connections, thanks

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[Figaro]

Connections switched and all working
Must be polarity sensitive
Thanks guys

 

[gus-lopez]

Connections switched and all working
Must be polarity sensitive
Thanks guys

Yes led's are.

 

[Figaro]

Every days a school day