S14 240sx alternator does not charge
This is usually a very simple fix.
The S14 lower (alternator/starter) harness has an alternator feed wire which goes into the engine bay fuse box. It looks similar to a ground, which means you probably ground it. Have a look on the engines intake manifold and see if there is a wire with a 90 degree terminal on it - it's probably grounded to the engine. If it comes up from teh lower harness, just move it inside the engine bay fuse box.