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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.