Alternator belt comes off - 2001 Kia Spectra

either the belt is not being routed(installed) properly, wrong pulley on alternator, seized alternator, belt tension er damaged or worn out, wrong belt.
press the helpful button and check link below

Techtips Diagnosing Serpentine Belt Problems

step one remove battery neg lug .
the above video (of book?) is wrong.
the belt tension-ing step was skipped.

remove belt steps remove alt. wiring. remove alternator (bolts) it falls free. replace it , reverse steps above belt back tension belt. battery cable back. test run. charge/BAT lamp off?
see wrench below, turn it CW.
this releases the spring tension and belt comes off
to put back, do same and put on belt and release wrench.

3.5L only. USA only.

CHECK ALTERNATOR DRIVE BELT TENSION IF BELT LOOK LOOSE ADJUST DRIVE BELT TENSION.IF YOU HAVE AUTOMATIC BELT TENSIONER CHECK FOR FOR BROKEN BELT TENSIONER. IF DRIVE BELT LOOK OKAY.CHECK ALTERNATOR VOLTAGE OUT PUT AT BATTERY WHILE ENGINE IDLING.BATTERY VOLTAGE SHOULD BE 13.5 - 14.5 VOLTS. IF NOT ALTERNATOR FAULTY.FIRST CHECK ALTERNATOR FUSE AND CHECK ALTERNATOR POWER FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE OR LOOSE CONNECTIONS. FIRST TURN OFF RADIO BEFORE REMOVING NEGATIVE BATTERY CABLE TO KEEP FROM LOCKING OUT RADIO.

Disconnect battery ground cable
Remove the ground wire (black) from the alternator
Disconnect the positive wire (red wire held on by a retaining nut) from the back of the alternator
Now disconnect the wire harness from the alternator
Remove the drive belt
NOTE: Some models use a belt tensioner that applies tension to the drive belt.
The best tool to use for this job is the serpentine belt too.
If you can borrow one from a neighbour you can get one at PartSource. (Part# 648451)
On other models you will have to loosen the adjusting bolt on the alternator bracket.
If you're not sure about how to remove the drive belt, visit your local PartSource for free print outs of car specific instructions.
Take off the mounting bolts from the alternator bracket
Now remove the alternator from the engine compartment

Installing Your New Alternator
Put the alternator in the engine compartment
Install the mounting bolts that connect the alternator to the alternator bracket
Connect the alternator wiring harness
Now connect the positive wire to the alternator
NOTE: Your new alternator should come with a retaining nut.
Remember to remove the nut before you install the positive wire.
If it doesn't keep the old nut.
Connect the ground wire to the alternator
Now install the drive belt
This is a great time to replace your old worn out belt. When inspecting your old belt look for signs of cracking, oil soaked, hard glazed, splitting or fraying.
All these signs mean it's time you replaced your drive belt.
If your vehicle no longer has the belt routing diagram under the hood, visit your local PartSource for a free print out of the belt routing diagram.
Reconnect the ground battery cable .

The pulleys may be out of alignment due to a bent or misinstalled alternator bracket. the alternator itself may be pulling so much current that the belt is slipping on its pulley. (might be why the other alternator failed. Check the battery voltage with everything turned off and see if you have a parasitic battery drain.) The bearing for the idler pulley (if equipped) could be failing.

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the link above should tell you all you need to know if you get stuck or have any problems give me a shout back ok

No timing involved with the belt. Something caused it to come off if didn't break one of the pulleys it runs on can be locked up or worn so that it wobbles. Water pump pulley is most common cause of trouble.

Removing the Alternator
Disconnect battery ground cable
Remove the ground wire (black) from the alternator
Disconnect the positive wire (red wire held on by a retaining nut) from the back of the alternator
Now disconnect the wire harness from the alternator
Remove the drive belt
NOTE: Some models use a belt tensioner that applies tension to the drive belt.
The best tool to use for this job is the serpentine belt too.
If you can borrow one from a neighbour you can get one at PartSource. (Part# 648451)
On other models you will have to loosen the adjusting bolt on the alternator bracket.
If you're not sure about how to remove the drive belt, visit your local PartSource for free print outs of vehicle specific instructions.
Take off the mounting bolts from the alternator bracket
Now remove the alternator from the engine compartment There. You've removed the alternator. How easy was that?
Installing Your New Alternator
Put the alternator in the engine compartment
Install the mounting bolts that connect the alternator to the alternator bracket
Connect the alternator wiring harness
Now connect the positive wire to the alternator
NOTE: Your new alternator should come with a retaining nut.
Remember to remove the nut before you install the positive wire.
If it doesn't keep the old nut.
Connect the ground wire to the alternator
Now install the drive belt
This is a great time to replace your old worn out belt. When inspecting your old belt look for signs of cracking, oil soaked, hard glazed, splitting or fraying.
All these signs mean it's time you replaced your drive belt.
If your vehicle no longer has the belt routing diagram under the hood, visit your local PartSource for a free print out of the belt routing diagram.
Reconnect the ground battery cable .

Replace the alternator.

please have your belt check first if it is slipping the alternator light will come on .most likely is the belt the only other thing could be the alternator.