Help what the? Indicators with dual filaments?

[saabman]

Hello All

I am stuck re wiring my Chevy Van to have Euro spec trailer lights...
I need to have independent indicators from brake lights so I need to get the front L&R indicator "juice" and bring them to the rear tailor plug...

I fiddled around and found that the front indicators bulbs have 2 filaments, what for???
Completely con-fused

Blown already one bulb in the process
Any suggestions welcome

[AndrewST]

One for the " position" light
One for the blinker

May be like that? or special CH version...
"... " in french

[saabman]

Nope it seems never to come on the second filament but on the diagrams says park light...

[saabman]

OK now I discover the trailer light units are duff
Gotta go and get the other set off the other trailer ...
a little brain helper might go a treat

[AndrewST]

Originally Posted by saabman

Nope it seems never to come on the second filament but on the diagrams says park light...

Wire cut somewhere...

Seem's like you have fun good luck

[saabman]

Ok after working about two hours on the trailer lights I started wiring again and at last at 7 PM Matteo and I managed to get the lot working... Now we have to tidy the wires away etc...