Originally Posted by Alan

For Porsche there is no distinction between Euro & ROW - there is just USA & ROW (with market specific M-Codes). Biggest differences in ROW are between RHD/LHD models and then Japan models - which tend towards some USA details, but are often RHD cars.

For ROW cars the outer red segment is a dual 21W Fog/5W Marker light the middle is a 5W marker only and the inner is 21W brake only. Turn signals and back-up lights are the same for all markets.

Having distinct function brake lights is a good feature to me, some LED conversions have much less distinction between the low and high power modes for these types of "dual filament" bulbs - this is a VERY BAD THING for safety!!

I'm glad we don't have rear fog lights in the USA - or the morons would just leave them on all the time - and we do have plenty of morons to go around.

Some of these morons even work at the DOT (well lets face it lots of them work there - very very over represented) - they are the people who allow us to have automatic front lights only - so that lots more morons can drive around at night without any rear lights on at all (not even really the drivers fault so much in this case! )

What Dr Bob says is also true - all S4+ lenses seem to be the same to me - mine also have the ROW markings by position. Both the bulb holder types (single/dual) will fit in all slots.

Alan

Originally Posted by Gary Knox

I think you can just turn the fog lights on. Then, even without the relay, the front fog lights and rear tail lights will both be turned on.

Originally Posted by Alan

No simple way to achieve this - it is possible of course, but it’s quite a bit of work involving diodes/relay plus wiring to switch the rear lights

Alan

Originally Posted by Alan

So for what you asked to achieve you'd need the fog light relay output to also drive the rear markers (rear/side markers also for a USA car). For ROW that is all you need. These details are of course are specific by model year:

On a '94 GTS that means you'd need CE: B21 (L) and/or CE: B24 (R) (these drive the front Fogs) to be connected via two ~10 A Diodes to CE: K13 (Tail Marker L) and to CE: H14 Tail Marker R).
The diodes need the Anodes to B21 and/ or B24 and the Cathodes (ring) to K13 & H14.

This preserves the independent parking light function, it does add to the loading on the Fog Relay, but really not close to its rating. Note it does not turn on front* markers - the only front lighting turned on are the fogs

- Note on a USA car the fog lights turn off with high beams on and this is problematic since you don't want the rear markers turning off with high beams on. The best solution is to use the ROW fog configuration by deleting the secondary fog relay VIII and replace it with a 30/87 bridge (928.615.125.00) as in the ROW cars. This will otherwise work similarly for USA or ROW

* also note: it doesn't turn on front/side markers for USA models.

Alan