1996 Nissan Altima Inhibitor Relay

It's called an inhibitor relay and only used on automatics. One of the blue ones if I recall.

Check the battery terminals for corrosion. Not charging usually battery problem or alternator. Try different battery.

Look for a relay block at the right front fender, under the hood. Bottom of the cover should show relay locations.

No, the inhibitor relay is to prevent cranking when not in park or neutral. You will have to look elsewhere for the no start. Check fuel pressure, and check spark.

If by lights, you mean the dash lights come on, then ignition switch must be getting power. If dash is not working with key on, check the 30 amp fuse link which powers the ignition switch.
If switch is good and starter is good, the start wire from switch goes to, if automatic, to inhibitor relay (the park/neutral function) and then to starter. There is also an inhibitor switch on the shifter or on the transaxle that turns on the inhibitor relay when key is on and shifter in park or neutral. The inhibitor switch is powered by a 10 amp fuse D.
If you have a manual transmission, the start wire from ignition switch goes to the clutch interlock relay and then to the starter. This relay is turned on by the clutch interlock switch on the clutch pedal.
You can check for power on either relay, the inhibitor relay or the clutch interlock relay, with a test light. Pull the relay out, have the key held in start position. Now both relays would have power showing on two terminals where the relay plugs in. If inhibitor relay only has power on one terminal or no power at all, either ignition switch is not sending power or fuse D is out or the inhibitor switch is not working right. If clutch interlock switch does not have power on two terminals either the ignition switch is not sending power or the clutch interlock switch is bad.
If the relay checks are good, check for power on the small wire to starter with key held in start. If you have power there, the starter solenoid must be out.

my 1992 nissan sentra will not start. It will trun and turn but will not start. when it does start.It missing alot and turn off very fast then it just turns but won't start

The starter inhibitor relay is located in the relay box just behind the headlight on the driver's side. It is Nissan part 25630-9662 and has six pins. There are two normally closed contacts that turn off cruise control when you start the engine. The other contacts are normally open and close to energize the starter solenoid when you start the engine. Power for the relay coil must pass through the transmission reverse/neutral safety switch when the transmission is in Park or Neutral. This switch is located on the side of the transmission and is reached from underneath on the front, driver's side. (Remove the plastic protective covering from underneath the engine in that area-it has about 10 screws.)

It's in the black box between the washer fluid reservoir & power steering pump on the left hand side of the engine. The box has the relays clearly marked.

HELLO I HAVE A 95 NISSAN ALTIMA THAT DID THIS SAME THING AND IT WAS THE STARTER CHANGE THE STARTER AND YOUR PROBLEMS FIXED

its the inhibitor switch
its located under the console attached to the base of the shifter you can possibly fix it with an adjustment if you get stuck let me know