2000 ford explorer not charging battery/?

My 2000 ford explorer quit charging. Took alt. off and replaced with rebuilt. Has good battery and charged up . started eng. and still wont charge. This is a ford any thing special I should check.? Fuses, broken wires ,fuse links. Has any one had this problum before. Need pro. help. Thanks
2000 ford explorer not charging battery/?
If your battery had a full charge when you replaced the alternator, it should not need to show its charging more than 12 volts. However, if you replace an alternator and tried using a battery without a full charge it can burn the new alt. There should have been a warning tag with the alt. Make sure all connections are tight and clean.


Another problem could be the starter is dragging or discharging the battery.
2000 ford explorer not charging battery/?
How are you determining that the new alternator is not charging? Are you actually using a digital volt meter to measure the voltage being generated off the back of the alternator? Or, are you measuring it at the battery? Or, is the alt/bat light on on the dash?





I would suspect a bad alternator...again. Depending on where you are purchasing your alternator from, it is entirely possible to get one that is bad out of the box. I've installed three bad alternators in a row before that a customer had purchased at a local auto parts store.
Reply:look for a blown fuse first after that i dunno if you just replaced the alternator, it should be good. to confirm that the alternator is good, try this, with the engine running, use a voltmeter and test the voltage at the charge terminal on the alternator, running should be between 13.5 1nd 14.5, but i have a feeling that you will find it to be considerably more. not check the battery voltage with the engine still running. if this voltage is less that the alternator, you have a broken circuit. you can use that same voltmeter and find the brake in the system, but the fuse is the most likely. i have seen this happen in a shop . the tech had just replaced the water pump on a truck and after starting the engine back up , the charge light stayed on. he replaced the radiator, and still the light was on, some one else took over and asked me what i thought, and i did the very test that i described to you and found a blown fuse due to a dropped wrench. that wrench crossed the charge back terminal and the case of the alternator, and blew the fuse.