I just got back from Cayman Brac.
I was using my brand new D200 in an Ikelite housing. My old dual DS-125s and strobe cable from my old D100 Ikelite setup.
It turns out my strobe cable at the attachment to the bulkhead has some faulty wiring. Most likely due to the wear and tear of the cable. In my old D100 setup (with no TTL), the flash would fire with manual flash settings. The new setup, the TTL would sometimes default and not fire ( this is associated with positioning of the cable). So without another cable, I switched to manual settings on the flash and the camera.
Still, I had about half of the photos not manually flash. The pics exif files said "TTL settings" for the ones that had insufficient flash, and "flash not attached" for the manual and sufficient flash. What am I doing wrong? I had the flash set to full (non TTL), and the camera set to manual flash. The only thing I can think of that I didnt' consciously set was the manual/ttl dial on the back of the housing. I don't know what the setting was when I was taking the pixs. Does it make a big difference?
My plan now is to get the cable fixed and make sure I have an extra cable for the next trip! But I would still like to get an answer for the future.
Also, has anybody tried to fix their strobe cables? I'm going to send mine back to Ikelite, but on a trip, are you SOL?