95 Montero with new alternator and a fairly new battery. While driving I noticed the charge was reading right at 12v. Got home and went to start it the next day to no avail. Turned the switch and heard a clicking sound in or behind the glove box but nothing from the starter. Has anyone experienced this problem before? Any help you can offer will be appreciated.
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Re: Car will not start.
That indicates a dead battery. Your alternator may have failed. Check the battery reserve power, and if it is under 8VDC the car will not have enough power to crank the starter. A healthy battery will be around 10-12VDC when the car is off.... and 13-14VDC while running.
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Start with checking the alternator voltage with a multimeter. With the car off check the voltage in the battery which should be holding 12v charged less if flat of course then start the car and test the battery again. If the alternator is good you should be getting a reading of 14 to 14.5 v if it's the alternator it'll A) not put any charge into the battery or B) be a very low voltage being anything under 13.5 v
Tom, When running voltage should be 14 to 14.8 volts, check all connections,fuses/relays,fusible links if equipped, bad battery, alternator defective, not wired up properly, broken wires loose alternator belt, etc. Diagnosing Alternator Problems EricTheCarGuy
The first thing you should do is check the water in the battery. If it is low, add distilled water to it. Ask a neighbor to give it a jump start. If you get it started and the car has a voltage gauge, check the reading on it to see if it is staying above 12V. Drive it around for a 1/2 hr to let the battery charge some.
If the gauge never gets above 12V, then either the battery won't hold a charge, or the alternator is possibly defective.
If you do get it started, you could drive it over to your local Autozone and let them hook up a portable tester to it. They can tell you if the battery or the alternator is having issues and they check it for free.
The battery probably was discharged when you were attempting to start the car without gas and just needs a boost.
It sounds like your alternator is bad. East way to confirm, take it to local auto parts store (IE: Autozone, Advance, etc) and have them do a FREE charging system test. Couple of thoughts; you have two new batteries and your poor alternator has to work twice as hard. After you put new batteries in, you've been running on straight battery power. Alternator normally runs all your electronics and recharges battery(s) but if Alt has gone "south" then you're on straight battery power.
You need to check the charging system. Take a volt OHM meter and go to the positive and then the negative posts. It will tell you how many volts it is putting out. If it is not charging at least 13.9 volts, then you bought a faulty alternator. If the alternator is good then check the belts to make sure they are tight enough. When you push on the belt at about 3 inches from the alternator it should not give more than 1/4 to 1/2 inch. If it does move more, then tighten the belts. If it is a V belt, just tighten the alternator. If a serpentine belt, check the belt tensioner and belt routing to make sure it is on right. The diagram should be under the hood.
well running the voltage from alternator should be at least 14 volts or a bit higher, engine off it should read at least 13 volts at battery. if alternater is less then 14 volts, it is the alternator at fault. or a loose alt, belt.
sounds like the alternator is shot and is not supplying sufficient power to the engine or even enough to charge the battery, try replacing it, and you said the dash light for the alternator is on so its most likely the alternator
Take a voltmeter with the car off and measure the voltage, should be around 12V. With the car running, measure again and this time it should read 13V-14V. If it does read 13V-14V then it means that the alternator is working. If it is below 12V, then it means your alternator is not charging the battery. If it's above 14V, then it means your alternator is overcharging and damaging the battery.
Ck the charge rate at the battery posts. The proper range is 23.6 to 14.2v , The higher the voltage the llower the amps. Ie; at 13v Alternator is about 10% under capacity. @ 12v it is charging at max capacity. @ 15 v isthe alt is not charging but frying your battery. 9amps is ok if battery is fairly charged but at start up it should sit on 13-13.6 volts. for about 15 seconds the start climbing to less charge towards 14.2.