my car died, won't start

[crypt2k]

I have a 90 240sx hatch with a 91 KA24DE. I waas trying to start the car yesterday to go to work but I didn't bother. The day before it was cranking real slowly like it needed more power but it still went on tho. All the lights go on. This morning I tried jumpstarting it but it wouldn't start at all. You guys have any idea what the problem might be?

[skylinedreams]

does the engine try to turn over or do you just get a click noise? when my battery died in my 90 it wouldnt turn over and when i tried jumping it i had to have my friend rev his car for like 5 min then my car barely started.

[my89240sx]

if it was your alternator, then she should still jump start. Sounds like you battery is gone. Will the accessories and light come on with the jumper cables hooked up?

[crypt2k]

All the lights go on without the jump... But the car won't turn over tho. I will try reving the other car for a while like you did. Hopefully it works.

[onosqv]

To find out if it's your battery is low, best way is to get a multimeter:

I believe cars won't start under 10v. Do this test w/o jumper cables.

Once the car starts, the battery level should be between 13-14v w/o jumper cables. This means your alternator is working. If it is whatever it was before jumper cables, your alternator is not charging your battery.

Easy test: take your friends battery and put it in your car for a little while, just for starting purposes, that will eliminate that right away.

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If you are getting 12v on the battery and the car is turning slow, your starter may be dying. Have some crank the car while you take a pipe/bat and tap the starter. If it starts, your starter is bad.

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How old is the battery? Have you done anything electrical w/ the car lately before this happened (i.e. install fog lights, hid's, etc). It can also be a loose connection or bad ground coming to/from the starter.

[skylinedreams]

Don't forget that if the battery doesnt have enough current it wont start the car either.

[240sx2nr]

^^^^ the battery only has current when its getting charged by the alternator.... so check battery voltage with DVOM