Hey Mark,
It's likely not the splitter itself, but the length of the plug that goes into the adapter. There are two "shapes" of the plug. One is short and fat, one is a little longer and narrower. The one you have is probably not making a connection with the contacts in the receptical.
Seriously. Any more than that and you're looking at an engine build, which is ~15k assuming your block is still good. This thread is getting ridiculous.
It's a sports car, and if you build it, it's a modified sports car. Shit costs a bunch of money. Hell, I'm only like 40k in on the build...