Has your alternator belt broken or alternator not charging the batteries? Check amps output from the alternator aswell it maybe undercharging them. Make sure all battery connections and earths are clean and their mounting points are clean. Is it the correct battery for the car?
SOURCE: 1999 Pontiac Sunfire wont turn over
ok i had kinda the same problem. if your father or bf is decent with mechanics ask him to check any see if there is any spark if not tell him to check the cranksensor to c if there is an current going to it, also when u go to start the car is there a (theft system light that comes on in the dash and flashes if so, turn the key fully as if you were going to start the car but dont crank it and leave it be for about 15-20mins or until the light stops flashing. then turn the key off and try start again. the thing is that when u install a stereo into one of these cars theres a anti theft system that stops fuel from going to the injectors. thats why when u install a aftermarket stereo u are supose to get eh harness so that it doesnt engage the ats(anti theft system). and if there is no current going to the crank sensor cut the wire long enough to hood an extra wire to it and then hook it up to ignition fuse in the fuse box(inside the car) this will send a a current to the crank sensor so when u turn the key on it will start. this is only a temperary fix. just gives u enough time to pick up the money to bring the car to the garage and get it checked correctly. anything else just ask. Jeremy
SOURCE: 2002 Pontiac Grand prix wont start; unable to remove key
On many cars, if the battery is dead, it locks the key in the ignition. Put a battery charger on the car or replace the battery and give it a shot.
Good luck.
SOURCE: I have a 1994 Pontiac Bonneville SSE.. won't start
It sounds like you have a short somewhere that is draining the battery...this type of thing is usually caused by a faulty voltage regulator. I recommend taking the alternator to an autoparts store to have it tested...don't be surprised if the alternator tests good; a faulty voltage regulator can and will drain a battery in a matter of hours. I am including a link where you can order a voltage regulator for your Bonneville or, while you are at the autoparts store, you can buy one there. The link will help you to see what the voltage regulator looks like so you can identify it in your engine compartment. Hope this helps, good luck!
SOURCE: 2002 pontiac montana wont start battery tested
no Alternator wont stop it from starting or rolling over as long as good battery...try connections on starter..that would be what i looked for first
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