Ford - Taurus :: 1999 - Bad Alternator Can Run A Battery Down?
Mar 9, 2011
I came out from work this afternoon to a dead battery in my '99 Taurus. I saw nothing left turned on. I got a jump and went to Autozone two miles away. By that time there was enough charge to restart the car. My battery checked good, but they said the car had a 4-1/2 amp draw when it was shut off. The alternator still put out over 60 amps when reved up. That's good. Can a bad alternator on a modern car run the battery down? I know the old ones did sometimes, but I thought they "fixed" that aspect of them several years ago.
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My battery went dead so I replaced with new. This did not fix the problem so I replaced the alternator. It's working now but the battery light stays on. I think I still have a problem.
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I have a 2002 ford taurus with a basic 3.0 v6 . The alternator stopped charging the battery.
New alternator
New battery
New pcm
Still nothing, this has been causing me the biggest headache. Alternator is pcm controlled btw...
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can I put the alternator from a 96 ford taurus in to a 97 ford taurus? Are any parts interchangeable on different ford taurus's?
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I put an O'reileys alternator in my truck today. Drove it most the day and did some plowing with it and it was fine. I just went out to run to the gas station and now the battery light is on. The voltage is still good.
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OK I have 14.04 volts at the batteries with the engine running but my battery light is on. I had the alternator checked off the engine and on the engine and it tests good. Shows good batteries and good charging. Is there something internal to the alternator that would make the light come on even though the alternator is charging ok? Or is there something else that would make the light come on. This is on a 1999 F250 Superduty Powerstroke 7.3.
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I have a 1999 f-350 V-10. My battery light came on, making me believe that my alt. has quit. I can't see the plaque on the alt so I can't tell the amps. Does my serial number on the truck tell the amps, or do i have to remove the alt to check the amps?
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Alternator locked up in a parking lot. Replaced it and had to replace pigtail due to a loose wire in the harness. Now battery light comes on intermittently. New alternator is doing fine producing anywhere from 13.9v to. 14.4v. No output voltage correlation to battery light at all. The belt is still in great shape so I don't suspect slipping. Fortunately I caught the old one locking up almost immediately and had recently replaced the belt. Output voltage looks great. Are there any fuses for alternator?
Only thing I can think of that I did...when splicing in the pigtail that connects to the alternator, I briefly grounded whatever wire in the pigtail is hot. Was just a split second, but enough to see a spark and maybe enough to blow a fuse? I've seen people reference an "under hood" fuse box, but I don't seem to have one. My truck is a 2002 CC with just over 100k on the clock.
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My alternator quit charging last night. Was pretty much a sudden onset as I was driving down the road and left off the accelerator the battery light came on and lights dimmed a bit. When I stepped on the accelerator again they bat. light went off and the lights came back up.
At idle I'm at 11.77v. I've pulled the plug on the back of the alternator and I'm getting voltage on both the red and green wires that go into the plug with the engine running. Is this correct?
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Pretty much as the title says, I'm having an interesting electrical gremlin. Ford 7.3 super crew 2002 lariat LE.
I have batteries from 2015 that are losing their charge, both of them. It's like the alternator isn't charging them. Truck will struggle to start until jump started, then she's fine.
Symptoms are:
ABS light comes on when as best I can tell the batteries aren't getting charged. Not the battery indicator.
Now that the batteries are low enough, on the instrument cluster the little light the powers the mile LCD screen dims when it's not getting power (but it's fine when the batteries have charge.)
All accessories work when driving, but I haven't been able to drive a long while on the "not charging phase" to see how low they're go.
Batteries register dead (now) because they haven't gotten charge in a while.
When the alternator IS charging or "connected" I can leave the truck idle and she'll charge the batteries, truck will start just fine on the next run (no parasitic drain.)
Driving causes this to happen randomly, doesn't happen when I'm stationary, nor do I believe it CHANGES state (so if I'm idle it won't suddenly NOT charge if it was charging before.)
Narrowed down to 2 probable things.
Alternator
Bad alternator to battery cables
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I had to replace my alternator (single unit) and after installation it seems only 1 of the 2 batteries is charging when I check them while the truck is running. What check or could be the problem?
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Took in the alternator to get it checked and they said it was good. Put it back on and it seemed like it was charging according to my volt meter (14.24-13.5 v)
Today, it's not charging. Only reads 12.2 v while running. Is there a fuse or something I need to check? Grounds? It seems intermittent.
2003 F-250 V10 6.8 liter 255,000 miles.
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I went to start my 2006 F350 6.0 this morning. 20 degrees outside. It nearly turned over, then it appeared that the batteries would not support another start - a slowing of the pre-engine start revving....
So I let it sit a while, now it won't start at all. When I try to start it, the dashboard flashes, clicking sounds occur and even after pulling out the keys, the needles on the gauges shake for a few seconds.
Is this more a battery issue or an alternator issue?
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Had a bad alternator, changed it, and now the battery lite stays on all the time..Changed the alternator again with a known good one, and the light is still on all the time..
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for some reason my battery light flickers when im driving regular and on the highway. I have had both batteries checked and they were at 50 percent charge and both were good so therefore I assumed it was my alternator. I removed alternator had it check and it passed all test. Everything was checked at o'reilly and autozone
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2002 Ford Focus SE with 130k miles on it. For the past 4 months the battery light flashes randomly while driving. The flashing and frequency of flashing doesn't seem related to anything I can tell including temperature, length of time the car is running, speed or any variable. Seems like it should be an alternator, but that was replaced less than an year ago and it also has a new battery. The alternator always checks out fine at the mechanic and it will never flash for the mechanic. It went 1 month with no flashing and suddenly it will now flash maybe 20 times in a 5 mile drive. Yesterday it just died at a stoplight with no warning, but then after shutting everything off it started just fine and the battery light didn't turn on for the 2 miles to home.
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Battery symbol light appeared on dash, After determining battery was good, I removed alternator and took it to have it bench tested at the parts store. It tested bad so I purchased a rebuilt alternator and had it bench tested before I left the store and it tested good. I installed it and it won't charge the battery. Tried a new battery...same thing. I tested the voltage at the battery and it reads 12.3 and the same with engine running. Engine runs until battery is drained. I removed the alternator and took it to a different store and they bench tested it good also!
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I am having a really curious issue with the charging system on my 1999 Golf VR6. The battery will not charge and the alternator seems to be nonfunctional. While running the voltage at the battery starts normal but drops until the engine dies within 20 minutes. Over the last two days I have replaced the alternator, battery, and the battery grounding cable with no change in behavior. The exciter wire on the alternator is showing 9 volts when the vehicle is running and 0 when it is off. There is 1.6 ohms of resistance between the B+ terminal on the battery and the respective terminal on the alternator. There is 0.3 ohms of resistance between the B- battery terminal and the case of the alternator. My task for tomorrow is to trace the exciter wire back to the cluster and try to troubleshoot it there.
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I am trying to change the alternator in my dohc but cant get it out, I am trying to remove the pulley on the crankshaft and cannot figure out how to remove it. How to get the alternator out???????
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The past few weeks the dashboard warning light for my alternator/battery will occasionally light up while driving down the road. Whenever it does, my plug in voltage meter shows a healthy 14.x reading. It usually goes out after a few seconds, but will stay lit up for as much as thirty seconds. So other than voltage being too high or too low, what else will cause the dash trouble light to illuminate?
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My alternator went out last week. I installed a new alternator, battery and serpentine belt. However, the battery is still dying. So far I checked the continuity on the fusible link and it appears to be good. I also checked fuse number 11 which provides power to the voltage regulator. The fuse is not blown. The voltage at the battery while it is running is less than 12 volts and it drops the longer it runs. I also have codes b1318, b1932, c 1226, and c1284.
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