What do you mean ??
Your starter only needs to have 2 wires going to it. One wire is the + hot at all times, connected straight to the battery. The other is the Ignition wire ( red / light Blue ) .. which I think youre mistaking for a ground, because its usually Black from being dirty.
Both of those wires run together under the engine to the driver's side, near the fuse box / battery. The + wire goes directly to the battery, and the Red / Light blue goes to a connector around the fuse box area, which is where it may switch to the White / pink colored wire that goes to your MLPS.
So .. you need to check if you have power along the line while the key is in the start position.
If you dont have power there, check it at the MLPS, if no power there, you need to go further up the line to the Ignition switch itself.
And you still havent mentioned if your car has Anti Theft or not ..
If you have a bad connection somewhere along the line, you should find that, instead of trying to splice in a power wire and a switch to make it start.
- Dan