Battery Relocate Engine wont turn over

[04mustang70]

I recently moved the battery and starter solonoid to the trunk. I am getting a 1 wire alternator and have already removed the voltage regulator and wires. After hooking the battery up I thought I would see if the engine would turn over. It does not turn over with the key. If I jump the posts on the starter solonoid the engine will turn over. What wires could I have screwed up? Its only the one wire marked S that goes to the ignition? I have not grounded the engine block yet but know I need to. Could this be the problem? What is the best way to trouble shoot this problem? Thanks

 

[A67StangMaster]

Yes Ground it first it "MUST" have a ground.

 

[04mustang70]

The reason it wasn't turning over was the solonoid wasn't grounded. Had it mounted in the trunk against the carpeted plywood I framed the trunk in. DOH!!!