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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

Can an overtightened alternator belt break?

Yes, and it can break and for sure will wear out the bearings in the alternator.

Why is voltage dropping slowly after installing a new alternator and a new battery on a 2002 Ford Focus SE?

Did you install a new voltage regulator? Is the belt tight? Maybe the "computer brain" is weakening.

Answer

If you have installed a new alternator and new battery, check the harness/wiring that plugs into the alternator, it may be corroded/bad connection causing your battery to not be recharged at idle speed; voltage should stay between 12-14.5v range and steady (some momentary drop may occur after turning hi beam lights, etc but it should return to proper voltage after a few seconds), as for the regulator, on most cases it is inside the new alternator so no further adjusting may be required; also, make sure you get the right alternator for your focus-there's like 3 types, the wrong one will cause your dashboard alternator lamp to be lit at all times-replace with right one or higher output if got power windows,seats,etc.Good luck! Buena Suerte!

How do you replace the alternator on a Skoda felicia 1998 and where do the wires go?

The alternator on my wife's Skoda Fellatio has just failed as well so I'm shopping round to order a new one.

Having had just a cursory look under the bonnet it all looks pretty straight-forward. There's a thin wire going to a plug that is, at a guess, the charging indicator. There's a thick wire that comes off of a stud and which goes directly to the positive side of the battery. This is presumably the main feed from the alternator. No other wires. Nice and simple.

Oh, and just three nuts/bolts holding the alternator in position. Should be a half-hour job to change one.

Cheers Gary

If its a diesel with power steering you are in for a shock, you need to take out the radiator to give clearance, take off the belt tensioner pulley wheel to withdraw one of the two bolts, (not three). The pulley bolt is left hand thread and is lifted clear to slacken the belt for removal by getting a spanner on it and lifting. Not as easy as it sounds, it has a strong spring and is a bit fiddly, once the belt is off you can then turn the bolt the other way to remove it and the pulley wheel. removing the left hand headlight helps a lot as you can work through the hole that is left. best to find a scrap yard that still lets you take bits off and do it there first on someone else's car. Its not as bad as it sounds but is not the twenty minute job I thought it would be. Good luck, Steve

If its a petrol with power steering and an MPI engine then you are in for an even bigger shock as I have only just discovered. Removing this type of alternator requires a special tool. Without the special tool IT CANNOT BE REMOVED.

The procedure is to undo the nut which holds the belt retentioning roller to the engine mounting. Sure, both upper and lower bolts can be removed however, without releasing the tension from the belt the alternator can neither be moved nor removed.

The problem exists due to the positioning of the alternator and the belt retentioning roller - there is only 1/2-inch clearance between the bolt-end of the roller and the wheel-arch.

The tool is not available for public use. I have spoken to Skoda who have confirmed this. Even if you could buy the tool it would cost somewhere between £40 - £70 (confirmed by Ashley Down Motors, Bristol, UK).

If you could get the car over to a garage who has the tool then you might be able to persuade them to undo the belt retentioning roller nut so that you can fit the alternator yourself on the roadside - although, they might not be happy about this so phone them first. It may also mean offering a token payment of say £10 or so.

Is there a special tool for tightening the alternator belt on a Dodge Neon?

NO WELD YOUR OWN,.. USE FLAT STOCK BENT TO THE RIGHT ANGLE AND WELD THE END OF A WRENCH TO IT AND NOW YOU HAVE A SPECIAL TOOL FOR THE JOB. ( KEEP IT IN THE TRUNK FOR THE MONKEY!) =Answer=!!!! there are two bolts to losen the alternator on the bottom bolt stick a flat tip (screw driver) underneath the bolt and pull the flat tip up and the alternator will rise if u can't put it in use a smaller one or pull up the alternator till u can put the flat tip in it always works for me on my Neon and other vehicals

Answer
Rear tension bolt
I used a 1/4" drive ratchet/socket. It would probably be easier if you had an offset head ratchet wrench, or bend one you have one already and are willing. Bottom pivot bolt/nut
I used a ratchet wrench in this location. made things very easy to get to.

This process is lengthly and will test your patience. Practice makes perfect tho.

How can i tell if alternator is not working on a 2002 ford focus?

Usually the appropriate warning light on the dash will come on if the alternator is not producing current. If you don't trust the warning light, take a volt/ohm meter and (making sure it is set on the DC reading scale) connect it across the output terminals of the alternator to determine if any current is being produced.

Is it common to have to replace both the battery and the alternator together?

It's not at all uncommon. A failing alternator can easily damage a battery.

What uses a relay switch?

Use of Relay SwitchesRelay switches are typically used for controlling devices/components that draw high current [usually measured in Amperes (Amps)]. It allows an operator to control heavy current devices using lighter control circuit wires.

This is done by manufacturers to reduce the amount of large, heavy wire in the run from the battery to a switch, and then from a switch to the high current using device.

They run a shorter heavy wire the shortest distance from the battery to the device, with a relay added in the circuit. They then run lighter control wire from the relay to a lighter/cheaper switch in the passenger compartment.

This serves two purposes:

  • Saving of weight, reducing overall weight of the vehicle, and
  • Reducing the amount of Copper wire, and thus material cost.

Where is the Alternator located on a 1999 Cadillac eldorado?

I have no idea about this specific car, but the alternator in general is an electrical generator which is driven off the engine's crankshaft. It will normally be at one end of the engine and driven by a belt - it is easily identified as it is about the size of a pineapple and is surrounded by coils of wire.

The alternator battery and brake light are on in my Pontiac Sunfire and now it will not crank so is it the battery or the alternator?

Charge the battery, start the car and check the battery with a volt meter. Should have over 14 volts, if only say 12.4 to 13, then change the alt. or check the wiring.

How do you replace the alternator Subaru Outback 1996?

I'm 99% positive that Subaru put the alternators in the same place on all their cars (engineconfiguration. I currently own three subarus: 94 legacy sedan, 96 legacy outback wagon and 09 impreza wrx sedan. All the alternators are in the same spot for all my cars. I'm pretty it's the same case for yours. I was able to remove and reinstall a new one on my 94 sedan in less than 20 minutes. I hope that this help. Here are the steps to removing and installing an alternator on a subaru.

1) Remove the negative battery cable using a 10mm socket or a 10mm wrench. Once the terminal is off tuck it to the side so it does not touch the negative terminal of the battery.

2) Remove the alternator pulley/fan belt cover. On the legacy sedans and outbacks the cover is metal and it covers the top of the fan belts. There are two 10mm bolts that hold this cover in place.

3) Look for a round plug (usually green on subarus) and unplug it from the alternator. Next pull the cap off of the red terminal on the alternator and use a 10mm socket to remove the nut. Once the nut is off pull the cable out from the terminal. The new alternator usually comes with this nut in place but I would still save it just to be safe.

4) Look for the two long bolts that hold the alternator to the brackets attached to the engine. One is to loosen the alternator from the belt (goes up and down). The other bolt holds the alternator in place at the other end. Both these bolts need to come off in order for the alternator to be pulled out.

5) Once the old one is out. Install the new one in reverse order.

Do i need a voltage regulator?

Whether you need a voltage regulator depends on your specific application. If you're using devices that require a stable voltage and your power supply fluctuates, a voltage regulator is essential to protect those devices. For projects with sensitive electronics or batteries, incorporating a voltage regulator ensures consistent performance and longevity. In contrast, if your power source is already stable and matches your device's requirements, a regulator may not be necessary.

How do you replace the alternator in a 1967 mustang?

Remove the belt from your 1967 Ford Mustang alternator. Disconnect the alternator wiring. Remove the alternator retaining bolts. Reverse the process to install the new alternator.

Where in alternator located on 2001 Toyota Tundra?

For a V8 you will find it under the left side of the engine. It can only be found underneath the truck. There to many parts on top to find it looking above.

How do change the alternator on a 2000 Mercury Sable?

Unless you're comfortable taking apart a lot of stuff, bring it to the mechanic. If you have the dual overhead engine (which I am assuming), your alternator is located under the engine. Access can be found through the passenger side wheel well. You have to pull out the splash guard and do take out everything in the way. If it's located on top, simply disconnect your battery, take off the belt, disconnect the connectors, pull a few bolts... it's pretty self explanatory.

How do you change alternator axiom 2002?

  1. Disconnect battery ground cable.
  2. Move drive belt tensioner to loose side using wrench then remove drive belt (1).
  3. Disconnect the wire from terminal "B" and disconnect the connector (4).
  4. Remove generator fixing bolt (3).
  1. Remove generator assembly (2).

Installation

  1. Install generator assembly to the position.
  2. Install generator assembly and tighten the fixing bolts to the specified torque. Torque: M 10 bolt: 41 N.m (30 lb ft) M 8 bolt: 21 N.m (15 lb ft)
  3. Connect wiring harness connector and direct terminal "B".
  4. Move drive belt tensioner to loose side using wrench, then install drive belt to normal position.
  5. Reconnect battery ground cable.

Ford 5.8 V8 marine braking alternator belts?

If you have a Mercruiser, there was a recall on the pulley that was first used. As I remember, the pulley was wearing out the belt prematurely causing it to break, and or jump off. I would check with a Mercruiser dealer to see if applicable to your engine.

How do you change the alternator for a 1992 Honda Civic?

Here are the relatively easy steps I took. The alternator is difficult to access, and cannot be removed without removing something--preferrably the easiest thing. # Turn the steering all the way to the left (makes things easier) # Disconnect the battery ground wire. # Jack up the car and remove the front driver's side wheel. # Remove the 2 alternator mounting bolts. Access to top bolt from top, bottom bolt from underneath. # From top or underneath (both are difficult access), rotate alternator so you can remove all the wiring (one plug, one wire wired to the post, and one retaining clamp on the back). # From underneath, move alternator back behind the engine to clear it from the alternator mounting bracket. # From underneath, remove alternator mounting bracket. Two 14 mm bolts (need a socket for one of them). # From side, in wheel well, unscrew back-most plastic screw holding front inside wheel-well splash guard on. # Pull Alternator out just behind the splash guard, flexing it out as you go. # Put the new alternator back in through the same hole. # Set the alternator aside and put the alternator mounting bracket on--tighten it up because you won't be able to access one of the bolts once you put the alternator on.

Notes:

You might want to make sure that the new alternator will fit in the mounting bracket while both new alternator and bracket are off the car. Sometimes the bolt sleeve in the bracket can be too tight and need a little tap to move it out.

You will probably lose the wheel well nut behind the plastic screw retaining the wheel well splash guard; mine fell into the body frame, never to be seen again. To fasten it back, I just used a pinched piece of coat-hanger wire to hook the wheel well back in place and then put some silicone on the hole so that water didn't go into the hole.

What happens if you jumped car and alternator is bad?

If you charge the battery and than let it run by itself, the battery will begin to slowly drain without recharging itself as you press the gas.

I'm going through what I believe is a busted alternator right now. Give me an hour and I'll tell you how it went.

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