Car will sometimes for about a week with the battery staying around 12v. Then it will randomly completly stop charging the battery. The battery and the alternator test good at autozone. I have battery volage on the back of the alternator, and at ground points around the motor. Have also replaced the positve and negative battery cables. I have checked and opened up the fuse box under the hood, all fuses and conections look good. I have no idea what to check now
If the batt is not charging u have a weak batt replace it and see if it works. it did for me.
I had a similar problem once and it turned out to be the ignition coil. Ran fine cold but once everything was heated up it broke a connection and went dead. I wonder if you might be having the same thing but in the alternator? Just a thought.
SOURCE: Here we go. Battery is dieing, had the battery
RAP stands for Retained Accessory Power. It is the circuit responsible for powering accessories when the key is off. Sounds like something is staying on that shouldn't. Hard to say what though with the information here. if this started happening right after you put in the new radio i would check into that. otherwise start checking accessories like power mirrors,seats, locks and see it something is staying on that shouldnt. i good one to check would be the glove box light or the light under the hood. you can unplug them and then test your draw to see if thats where is was.
SOURCE: battery won't stay charged
You say your test light was hooked from the negative terminal of the battery to the chassis? This is correct?
If so you don't have a short you have an open circuit.
You will have a bad ground somewhere between the battery and the engine or between the the engine and the body. Trace your grounds.
If you need more help leave a messege in "add comments" and I will help you along.
KL
SOURCE: 1999 Isuzu Trooper Problem with Blower Motor, FUse Box, and exter
Did you find out a solution to your problem? I have a 1996 trooper that is showing most of the same symptoms that you have. I'm curious as to your fix. Was it simply a bad ground?
SOURCE: i had my battery fully
There is a strong possibility that you may have what is called a parasitic drain on your battery. Which simply means that there is something running in the background that is pulling a load on your battery. These kinds of drains can extremely hard to find. To help you determine of you have a parasitic drain you will need a multimeter. If you do not have one I would recommend taking your vehicle to a trusted automotive service center. Call then first to determine what they charge per hour for diagnostics. usually will be about 1 to 2 hours diagnostics time.
SOURCE: i have a 1998 ford
If alternator and battery are both good then it has to be a wiring problem. Check your wiring again at the back of the alternator pay close attention to the connectors that plug in to the alternator. They could be loose. Also check that your battery terminals are clean & tight. Hope this helps :)
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Have not fixed it yet. The grounds coming off the battery/starter, are good and clean.
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