1993 nissan altima starts sometimes other times it does not crank over battery is good also installed new ignition switch

Power Transistor Test and Ignition Coil Test 2.4L Nissan ...

easyautodiagnostics.com > Nissan > 2.4L
Mar 9, 2010 - If your Nissan Altima CRANKS but does NOT START or runs with a misfire... this is the article that will help you test and diagnose your Altima's 2.4Lignition system (1993-1997). ... With the tests in this article, you'll be able to test and diagnose: A BAD power transistor (ignition ...

sounds like a bad crank position sensor

Check ignition switch, and starter solenoid for functionality. Also, just because the horn blows, doesn't mean the battery holds a good enough load to crank the starter. Check to see if battery voltage drops when key is turned.

Check the transmission neutral start inhibit switch is not the cause of your problem. (try both 'P' to 'N' positions).
If the headlights work ok there should be enough power in the battery to at least make a solenoid type noise when start is attempted- so it may not be caused by a faulty alternator.
Check the battery terminals are clean and firmly attached to the battery,
Check battery is properly grounded to the chassis and motor,
Check that +12v is available at the starter motor engage solenoid when the ignition switch is held in the 'start' position - check any start slave relay operation.
If all above is OK, you may have a faulty starter motor.

there is whats called a fuseable link on the + side of the battery taht may have burnt out over time!
bst get a auto electrician or a mechanic to come over & test it for you
Good luck Cheers Rob.

sometimes if the steering wheel is in a bind the switch will not turn try turning the wheel a bit while at the same time turning the switch good luck

check ignition relay? also could be worn gnition barrel?

do you tink maybe it might be the ignition switch

change your crank angle sensor and it should fix your problem