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Alternators

An alternator is an old term for electric generator that converts mechanical energy to electrical energy producing alternating current. Alternators are mainly used for recharging batteries and to power electrical loads of vehicles.

4,629 Questions

What concerns should you have when changing the alternator on a 2001 VW Jetta?

I have a 1999 VW Jetta GLS 4 cylinder 2.0liter SOHC New Body Style. My Alternator died, according to the technician at the VW Dealer. The electrical system diagnostics done by the tech indicated that the alternator was producing only 10amps and should be producing something like 14 amps. Backing up a bit; during the morning of the failure, my battery light went on. Later that night, I noticed that all interior lighting (including instrument dash-board lights) went dim. Additionally, the brake, ABS, airbag, etc. lights went off and a beeping noise occured. Long story short, my car started to sputter and eventually died on the highway. When I tried to start the car, the engine would barely turn over and the instrumentation lights flickered rapidly. I called around and found that PEPBoys or Advanced Auto Parts had Bosch alternators that fit my car for like $250. Bosch alternators at VW Dealer Parts Department costs $500 minimum. I'm not sure if it's the same one, but the VW guy on the phone said "Bosch". You do your own reasearch. Labor is 1.5 hours. Total from VW Dealer was around $750.00. I'd like to hear the experience of others as well.

How do you replace the alternator on a 1998 Chevy Tahoe?

1. Disconnect Battery2. Disconnect Wiring to the Alternator3. Remove Serpentine Belt by using a 1/2" drive ratchet or strong arm...Observe how the belt comes off4. Remove bolts going through the alternator and you should be able to pry or wiggle the old one out5. Use reverse proceedure to replace

What is the cost of replacing an alternator?

I just paid $310 ($254 parts & shop supplies, $56 labor) to have alternator replaced on 2000 Olds Bravada.

If your battery does not hold a charge do you need a new battery or alternator?

Probably alternater if the battery is less than 5 years old, may be the battery, may be both, may be neither.

What are causes besides the alternator that can continuously pull down the battery?

Parasitic (or ignition key off) drain is the cumulative load produced by electrical devices, for example, emissions computers, clocks, security alarms, radio presets, etc., that operate continuously after the engine is stopped and the ignition key has been switched off. Normal parasitic loads are below 75 milliamps (.075 amps). When the parasitic load is greater than 75 milliamps (.075 amps), batteries will drain more quickly. Glove box, trunk, and under hood lights that do not automatically turn off when the door is closed or shorted diodes in alternators are the most common offenders. Cooling fans, power seat belt retractors, radios and dome lights left on, alarm systems, and electric car antennas have also caused batteries to drain overnight. Leaving your headlights on will generally discharge a fully charged car battery, with 90 minutes of Reserve Capacity (36 amp hours), within a couple of hours. It is highly recommended, especially if you are using a sealed wet "Maintenance Free" (Ca/Ca) battery, allow to thaw if frozen, fully recharge it in a well ventilated area with an external battery charger, remove the surface charge, and load tested both the battery and the charging system for latent damage from the deep discharge. You could have a damaged or bad battery. If the alternator is warm and the engine is cold, then check for a shorted diode in the alternator. Below are some methods that are used to test the parasitic load with the engine NOT running, under hood light disconnected, all accessories switched off, and the vehicle doors closed: * Connect a 12-volt bulb across the positive and negative battery terminals to test the bulb and the battery. If it glows brightly, then remove the negative battery cable and connect the bulb in series between the negative battery cable terminal clamp and the negative battery terminal. If the bulb continues to glow brightly, then start removing fuses or connections to the positive battery post one-at-a-time until the offending electrical component is identified by the bulb dimming. * A better approach is to use a DC ammeter, for example a Fluke 175, inserted in series with the negative battery cable terminal clamp and the negative battery terminal or a clamp-on DC ammeter, like a Fluke 336 or i410 around the negative battery cable. Starting with the highest scale, determine the current load. If the load is above 75 milliamps (.075 amps) after the initial surge, then start removing fuses or connections to the positive battery post one-at-a-time until the offending electrical component is identified by the parasitic load dropping to within 75 milliamps (.75 amps). ADDED 25-APR-06 BY Guycaron: For whatever it's worth, this problem came up in both my '86 LSC and '91 LSC/SE. The quick solution was a new voltage regulator. Cheap, easy to replace. Worked both times.

What is wrong when the alternator is charging and the car still looses power and shutoff i then jump start the car it runs but only for a short while then shutdown?

Engine Dies, but Runs for a while After Jump StartingIf you're sure the alternator is working properly, I suspect that you have a loose, or disconnected, connection of the conductor [wire] that is supposed to carry the alternator charging current to the battery, OR a battery that has become defective.

How do you remove alternator in 2003 Ford F-150?

Do yourself a favor. When buying a New Alternator have them check it before taking it home? I had a bad incident that I ended up with, 3 bad alternators in one day, 3 different stores. Last store check it before I took it home and everything was good. I ended up changing it 3 times. Make sure they also change the pulley. Alternator Removal & Installation 1. Disconnect the negative battery cable. 2. Rotate the drive belt tensioner away from the drive belt and remove the drive belt from the alternator pulley. 3. Detach the electrical harness connectors at the alternator assembly. 4. Disconnect the positive battery cable and remove the nut and washer. 5. Remove 2 front alternator bolts. 6. Remove the rear alternator support bracket retaining bolts and the support bracket. 7. Remove the alternator from the vehicle. To install: 8. Place the alternator in position and loosely install 2 front alternator retaining bolts. 9. Install the alternator bracket and 3 alternator bracket bolts. Tighten to 84 inch lbs. (10 Nm) 10. Tighten 2 front alternator retaining bolts to 19 ft. lbs. (26 Nm). 11. Connect 2 electrical hardness connectors to the alternator assembly. 12. Connect the positive battery cable and install the nut and washer. Tighten the nut to 72 inch lbs. (8 Nm). 13. Rotate the drive belt tensioner away from the drive belt and install the drive belt on the alternator pulley. 14. Connect the negative battery cable. 15. Start the engine and check for proper charging system operation.

How do you replace an alternator in a 1999 Nissan Maxima?

* Disconnect the negative battery cable * Raise the car and support it securely on jackstands.Remove the lower splash shield beneath the alternator and the right-side inner fender splash shield * Remove the drivebelt * Disconnect the electrical connector and the alternator output wire from the alternator * Remove the engine cooling fan and shroud * Remove the air conditioning compressor mounting bolts (without disconnecting the refrigerant lines) and slide the compressor forward * Remove the alternator mounting bolts and remove the alternator from the engine

How do you change an alternator on a 2002 dodge neon?

Disconnect bat. Remove wires from back of alt. If serpentine, pull on idler(s) to release belt tension & remove belt. if not, Loosen alt bolt on top & swing to side to remove belt, Remove bolts 6 & 12 o' clock & remove. reverse to install. have fun:)

Do you need to reprogram when changing alternator?

As you will need to disconnect the battery you will need to reprogram the preset buttons on your radio and set the clock. Other than that there is nothing else to do.

Who invented car alternators?

Hungarian scientist, Elmer Wavering invented the first car alternator. His invention hit the mass markets in the early 20th century.

Where is the alternator located on a 1996 Pontiac Bonneville SE?

It is located top left of the motor if you are looking at it from the front bumper

Plymouth Voyager alternator going bad How do you tell?

There are generally two signs that the alternator is going bad.

First is the noise. A new noise will begin to be heard. Something like a whining when the car is accelerating.

Second is the smell. You may smell burning from the engine department.

Where is the voltage regulator on a 1973 ranchero?

Near the headlights assembly on the passenger side of car. Remove battery to get to it. Mounted to fender.

Remove alternator from 94 Mercury Capri?

i have a 91 i imagine that it wouldn't be much different first i removed the passenger front wheel and then i removed that part of the air dam and right up inside you can see the alternator. from the top its a tight sqeeze but take the top bolt on the alternator off and take the belt off then go underneath and remove the bottom bolt and then remove the clip on the backside of the alternator. next, remove the tubes and any other things that might get in you're way then just pull it out of the top. installation is reverse of removal just drop it down in there and reconnect all of the tubes in the same order and put it in and make sure you have the belt tight

What tools you need to replace your alternator on 02 odyssey?

I'm not familiary with the odyssey, but you'll need a metric wrench (I don't know what size, though, but it'll be metric.. 13mm or 15mm are the likely sizes), and a slotted screwdriver (to separate the ring terminals from the posts).

How much should it cost to replace the alternator on a 2003 Mazda Tribute?

a lot! its a long process and after doing it once, i will sell the car before i put another one on. there is a lot of stuff that has to be taken off to replace it, and the only way to get to it is from under the car.... like i said, i will not do one again.

Where is the voltage regulator on a 1974 Chevrolet pickup?

It will be mounted behind the battery where the head lights are.

It could be on the fender where the battery is.

How do you change the alternator on a 1997 Nissan Maxima?

Need to lift car. From the bottom remove the compressor it has 4 bolts, then you will be able to see the bolt that goes to alternator, also loosen the pully from the top then and bottom the botom.

How do you replace the alternator in your 1995 ford econoline 250 van?

Remove negative off the battery then remove air filter is in the way you got to get a 3/8 to the tension to remove the belt the the connection to the alternator the red first then 2 long screws in the bottom then 3 screws on the top they are all 10mm then you got 2 more wires a to remove from the alternator be careful and that's i hops this help.1998 e -2505.4l v8

Hooked up my jumper cables the wrong way by mistake in my 97 grand Cherokee Laredo 5.2l does this have a separate voltage regulator component or is it located inside of the alternator IT RUNS HI IDLE?

If the jumper cables were hooked up the wrong way by mistake on a 1997 Grand Cherokee Laredo 5.2L, it might be necessary to check the alternator to make sure it is turning in the right direction. If the battery is still being charged, the vehicle should be fine. A high idle could be a problem with the EFI or Electronic Fuel Injectors.

Does the alternator cable go first or the posotive cable when installing a car battery?

I've found it best to connect the pos first then the negative last. If you connect the negative first there is a good chance that you might accidently ground out the positive against some part of the car.

Why is Alternator making a winding noise?

Could be you have a bad belt or belt is loose.. Also it might be possible that the bushings are worn out of the alternator