First off, if you changed from automatic to manual you
need a new starter, because an automatic starter will NOT disengage from a flywheel.
The starter will eat itself as soon as the engine is running.
Second, I'm assuming that you are talking about the engine ground cable.
The ground cable goes from the battery to under one of the starter attaching bolts
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.