Charge light comes on better batt put in what now

Did you check the fuse in the under hood fuse box ? GEN / BATT fuse 10amp . Is your check engine light on ? This is a computer controlled charging system , it should have four wires connected to the alternator . 1 - the heavier wire on the back ,this comes fro the starter - the one with fusible link , you could have checked for battery voltage with voltmeter ! The three other wires in the connector are the orange one ,this comes from the GEN / BATT fuse an should have battery voltage ! The last two come from the PCM - engine computer . The gray wire is the turn on signal from the PCM an the Red wire is the control from PCM ! Charging System Wiring Diagram MOTOR Magazine Article MOTOR Information Systems

A bad alternator no longer charges the battery, the battery will die once it is drained. This will occur more rapidly when using equipment that runs off of the battery( lights, heater blower, windshield wipers etc.) even electronic ignition will run down a battery. Your battery just went over night the alternator may have stopped working long before. Go to an auto parts store that offers free testing to make sure it is your alternator before making repairs.
Good luck.

Are you getting spark to the plugs and normal fuel pressure ?

Have you checked to see if it is charging when the lite is on? I would change the alt the brush's get uneven and warn and decide to charge when they want to.

I had exactly same thing on my boat recently...which has a car motor in it. And I also charged the battery and I also had a reading that said I had charge. HOwever, I tried another battery from a car and it suddenly worked. Don't know why, but it really was the battery. When I put the old one back in, it still wouldn't start. With a new battery it's fine. Ya just never know why sometimes!! Good luck!

could be a problem inside the alternator
you might want to have it bench tested at a store

WELL HOW DO WE KNOW THE ALTERNATOR IS BAD OK DOES IT CHARGE THE BATTERY,WHEN YOU DRIVE AT NIGHT ARE THE LIGHTS DIM, ILL MAKE IT SIMPLE FOR YOU START THE CAR WHILE ITS RUNING DISCONNECT THE BATTERY IF IT TURNS OFF IT JUST MAY BE BAD ALSO CHECK THE VOLTAGE ON THE BATTERY 11.5 - 12..5 GIVE OR TAKE WAIT A WHILE AND CHECK THE VOLTAGE AGAIN TO SEE IF THE BATT.IS HOLDING CHARGE OR BETTER YET TAKE THE BATT. TO THE PARTS STORE THEYLL CHK.FOR YOU FREE DO THE SAME THING WITH THE ALTERNATOR HAVE THEM LOAD CHECK IT ALWAYS GET A SECOND OPINION WHENEVER IN DOUBT GOOD LUCK

Battery should not go DEAD,have charging system tested with car running should have at least 13.2 volts at the battery. get back to me if you need more help Thanks Ray

My Answer:

Being an expert in this Electronics field this should be fairly easy.

It appears your charging system is functioning OK as you did the QUICKIE alternator/regulator test and that part appears to be fine.

Next - Never ASSUME you have a good, or NEW battery. I've seen brand new batts fail a few months after purchase for no known reason at all. Water level should be topped off esp during Hotter weather as water level will drop as the batt ages.

AND - when in doubt - Always do a hydrometer test on each cell, and make sure all cells read equally at approx 1.285 to 1.290 - indicating a fully charged batt.

When doing a LOAD TEST with an external 100 Amp Load Tester make sure you disconnect the POS terminal cable (or better yet both batt cables) on the batt before doing a good Load Test on a fully charged batt.

Batt voltage on a good fully charged batt should never drop much below 11.4 to 11.7 volts doing a 10 second load test using a Load Tester similar to say one bought at Harbor Freight Tools for like $15 when they are on sale.

If the top of the batt is wet (for whatever reason such as dew-point or leaky batt acid) this will cause the batt to self-discharge right across the top of the batt. Just like putting a small light-bulb across the batt posts and causing a drain. It happens more times than you care to know. When I worked at SEARS I seen it day in and day out......trust me I know!

Next - you'll want to check for a couple things at night, or else daylight will work as well - if you have good eyesight. You want to check and make sure your "backup lights" aren't ON when the Headlights Switch is turned OFF and the Ignition Switch is OFF as well. Sometimes a SHORTED Transmission Backup Light Switch will cause a battery drain with everything shut off. Sometimes!

Also - If you have any Interior Lights left on when the SUV doors are all closed that will surely drain the battery down.

A radio/stereo left ON will do the same as well.

A shorted tail-light (or any marker light) will also cause a battery to drain over time.

Jeeps that have a under the hood light Mercury Tilt Switch for the Engine compartment sometimes can have this switch mounting come loose and when you shut the hood the light will actually stay lit thus draining the batt down as well. Make sure you check it at NIGHT during darkness as it will show up better.

If all this proves NOT to be the cause then you will have to do an actual DVM inline amp meter test to see just how much current leakage (shorting) you have. A fuse block isolation test will next have to be done to isolate from which circuit leg the short (or current drain) is coming from.

Once that circuit is isolated then it's just a matter of finding the shorted device or shorted wire(s).

If you just added anything new electrical wise to the Jeep recently- then that is a good starting point - for if the problem wasn't there before that time, and now it is - then there is your culprit!

If you are using an external battery charging PV (Photo-voltaic) panel, and it's bad for any reason - then it will drain your battery down as well, esp if the blocking or back diode goes bad.

Also - If you have a dual battery system with a BATTERY ISOLATOR installed you might want to double check all your wiring there as well - as I've seen them go bad and cause many a battery problem!

It's gotta be something I just went over here - as I covered everything......

Let me know what it was OK?

Thx,

Frank

So found the problem it was the seilnoid on the wasnt working properly store said good put it back hit with small hammer fired up so just replaced whole strarter now fires first time sounds awesome had lot of trouble tracking it down went threw new battery's thinking that was prOblem but was bad starter unit try this maybe will help u to