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Alternator require extensive work to be repaired. On a 2004 Hyundai it is best to replace a broken unit with a new part.
best way to do it is from the underside using mostly box-end wrenches
if you dont know what your doing best leave this one to the profesionals as they're very difficult to do
Best to get a shop manual for this operation, if you have not replaced it before. Usually there is an "Idler Pulley" on many late model cars that is "spring loaded". You "Bias" this pulley (usually with a socket wrench) so that the serpentine belt has enough slack in it so you can remove it. Then you disconnect the Positive Battery cable, disconnect the "Field Wire" harness and Positive battery lead from the alternator, unbolt and remove the alternator. Reverse procedure to install new alternator. TommyTrouble
its the one next to the alternator, it has a nut in the center and a bolt just under it losen the nut on the pulley and the bolt under it. Its best if you go in from the side
If your alternator is defective the best thing to do is to purchase a rebuilt alternator and trade yours in on it. Much simpler and easier than trying to rebuild it yourself.
It would be best to remove the alternator and take it to an electrical shop.
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
The best way to install them is the correct or suggested way. This should not be a do-it-yourself project and one should use a professional carpenter to install them to get the best results.
Bad bearings in the alternator. Best to just go ahead and replace it.
To tighten the alternator best on a 240sx, loosen the bolt on the alternator on the drivers side. Pull on the alternator away from the engine to adjust the belt. When it has no more than a quarter inch of give, tighten the bolt to finish.
A double din unit will fit in the Trailblazer/Envoy platform vehicle however you will need adapters. If you are experimenting then you are best to let a pro do it.