Per this thread... http://www.bimmer.info/forum/showthread.php?t=35188

So I COULD troubleshoot and try and find out why that one fog is giving out 9.5v... but sometimes you just say screw it.

I used a relay kit and just hooked up the fogs direct to the battery terminal under the hood.

Battery -> 15a Fuse -> Relay

Relay -> Functioning 12v fog lead
Relay -> each ballast

Cool? Not quite. F/Fog comes on immediately because the 9.5v fog lead is open.

9.5v fog lead -> load equalizer*

Almost there. Now it says F/Fog when I turn on the fog because the relay cuts the functioning side off.

12v fog lead -> load equalizer*

Done. No more warnings. A lot more wiring under the hood, but it works. I'm happy. The hardest part was finding something to attach to the positive battery jumper terminal.

*load equalizer



6 OHM ALUMINUM
50 watt Load Equalizer
Adds about 25 watts of load