battery Light question

[1988starter]

Ok I am working on a new 86 LX and It's battery light is on but it shut of every so often what could the problem be I just changed the batery I thing the cold output is 405 and the hot is 500.

[carotman]

can come from the carging system. Check your alternator and every wire comming to it... this might be the problem.

[dXsquared]

if the car is not running, and tyhe key is at II then it comes on and stays on. if it is running, then i have no clue.

[1988starter]

it comes on after about 2000 rpm then goes off after you get below it.

[1988starter]

Any other hints

[carotman]

no need for other hints, I gave you the correct answer :p

This is a problem with the charging system..

Check the wire connections around the alternator and remove any rust you find. If the problem is still there, get your alternator checked. It may not charge enough or the voltage regulator is busted and pumpingtoo high voltage... thus causing the problem at higher RPM

[1988starter]

would that also make the battery drain every night. Or after it has been off for a while. I had it running last night but it just was drained this morning I will do what you said this morning or after class I only have a few today and no english. Also sorry for my stupidity I do trust what you say just making sure any other possibalitys are gone. Just one more thing are rotors hard to change out I have a manual and it does not look hard. Usually I only do the pads my self. thanx.

[dXsquared]

it takes about ten seconds, if you have an impact screwdriver or impact gun.
1. Take off the wheel.
2. Take the caliper off.
3. There are two little flush mount screws between the bolts. Take ur impact tool with the right tip, and take them off. After that, the rotor will fall off.
4. To put back on, reverse the steps and it will be oooo tay!

P.S Dont even bother tryin wit a regular screwdriver. I did and it didnt even budge. I had to walk all the way to my neighbors to borrow his impact gun. (my gun ate itself a week ago, dont forget to oil ur gun every time u use it boys and girls, cuz i forgot!)

[89accordlxi]

Originally posted by 1988starter
would that also make the battery drain every night. Or after it has been off for a while. I had it running last night but it just was drained this morning I will do what you said this morning or after class I only have a few today and no english. Also sorry for my stupidity I do trust what you say just making sure any other possibalitys are gone. Just one more thing are rotors hard to change out I have a manual and it does not look hard. Usually I only do the pads my self. thanx.

Definitely sounds like a charging system problem. If you run the car and the battery is still draining then that means the alternator is not charging the battery. So either the alternator is bad or the wiring somewhere along the line is bad. Do what carotman suggests and see what happens.
Another thing you can do is use a voltmeter and test the voltage at the battery with the engine off and then with the engine on. With the engine off it should be about 12v with the engine on about 14v.
good luck
I'm out...

[1988starter]

Well my mechanic let me borrow his match testor. My new battery is perfect and the altermator burried the needle on the high side I am currently looking for a new one I will try some junkyards tomorrow.

[smufguy]

if u wanna replace, get a refurbished one or an aftermarket altenator. dont go to the junkyard. of course u would get a cheap one, but how long would it last? do think about it before u hit the junk. those are crucial ones which need to be replaced by good ones, or cars in the junk that were driven in or just met with an accident.

[1988starter]

Yea I am probably going to action auto the sell rebuilt ones and junked ones but I will go rebuit.