Where is the neutral safety switch located on a 1994 manual Pickup? on 1994 Isuzu Pickup

The problem started a couple of weeks ago. The battery was replaced, the starter is okay, the alternator is okay, new spark plugs, new ignition coil, and so we are down to either the battery not powerful enough for the pickup or it is the neutral safety switch; which we are unable to locate. Please help!

Asked by for the 1994 Isuzu Pickup