Dude, your box is kaput. Did you buy it used? Sounds like you picked up a used VGA box that was already hacked for 15 khz
. And whoever owned it previously must have also cut the 6th wire from the other (wrong) side as well.
If you count over 6 pins from the left with the VGA box connector turned pins up and facing you, then the 15 khz pin is 6th from the left. And if you count 6 pins from the right, guess what? It is the S-Video output. Coincidence that your S-Video is kaput too? I think not. If you didn't buy it used, you bought a previously returned product pawned off by your retailer as new.
Do yourself a favor and go to
www.jandaman.com and get one of their two VGA solutions, either the cable or the box. Both are great. I run all 4 of my 15khz cabs with them (combination of 2 cables and 2 boxes) and I have another VGA box hooked up to my PC monitor for good measure! Did I say that both are just under $9 and $10 respectively. The last order I placed with Jandaman was shipped to me in less than 5 days (Sat and Sunday was inbetween) and I bought 2 VGA cables, a VGA box, and a Joybox. Shipping was just over $4. US based, rock bottom prices for the VGA box, and no mark up on USPS Priority shipping. You can't go wrong.
Ok, Jandaman owes me some kick back now! j/k. More than happy to give exuburent praise when I am a satisfied customer!!!!!