First you look and try to jump it if it rumbles its the allternater
If it's the ignition your vehicles motor will not turn over at all. If it does turn over it's either one of three things: battery, alternator, or starter. You can take your starter, battery and alternator to a local advance auto parts and they will test the charge for you. That will tell you what you need to know.
Take the car to a repair shop and have them do an electrical systems test. It should include testing the starter for the amount of current dtraw it has. Also the alternator for amperage and voltage output and the state of the alternator. If the battery is low then you will get a bad starter reading.
It is stamped on it. Look at it real close.
Test the battery with a digital voltmeter. You should get a reading of 12.6 V if the battery is fully charged. If the battery is fully charged then you know the alternator is functioning properly and your problem is more than likely a defective starter.
Loose, defective, or corroded cables, loose ground wire, starter, or starter solenoid.
nissans are pretty reliable as far as engines go. i have a 98 se-r i need a bit more info to tell you anything. but if its clicking when you start alternator, battery. if it does nothingwhen you try and start it its the starter it may also click if its the starter. you can get your alternator checked at advance auto parts for free, also your starter.
When your car isn't starting the car you can't hear it while turning on the ignition. You're gonna have to check the battery and alternator as well before replacing a starter.
Start the car, unplug the battery the alternater should power the car. If it dies the alternator is bad. You can also get it checked at any parts store.
If a starter relay or solenoid is bad, usually you will only hear a single click when you turn the key to start the engine.
Check the timing.
go to autozone.com and enter your 94 Nissan info,engine size ,2wd or 4wd,then look up alternator,then to the right of screen look up repair guide,it will tell you what you need to know to replace your alternator,good luck.
If your Geo Prizm is stuck in park and will not shift, the transmission is locked up. It will need to be serviced.