Why does the battery light stay on. when ive already put new alternator and new bettery in car.

SOURCE: Car wont turn over

Sounds like you have a bad starter. To check this you can try taking a hammer to the starter and tap it while someone in the car turns the key. If it starts you know you have a bad starter and need to replace it. Hope this helps you out

SOURCE: seccurity light staying on car starts and shuts right off gas gauge shows empty

I had the same problem recently. Was quoted $400 - 500 for a fix, but when they got in there it was just a wiring issue. Still cost $220, but that was labor only, took about 3 hours to fix.

SOURCE: Chevy Blazer 1999,car doesn't keep running after started ,car has Passlock

hmmm, sounds like an ignition switch problem. Not the tumbler/key switch, the ignition switch.

SOURCE: 1999 S10 battery light stays on

could have a loose wire did you check your alternators output voltage? if it's 13 to 14 drive it, as these have internally mounted voltage regulators

SOURCE: wont start security light stays on

Body Control Module (BCM) on both counts. Find a shop in your town that specializes in electrical systems to test it. Beware, these can be intermittent problems, so make sure they keep it until the car does what you have observed. Expect to spend about $450 for the replacment. Dealers quoted me between $700 and $1,100 for the same repair. By the way, a new BCM will probably only last you about 12 months.