Alternator Replacement
How are alternator issues diagnosed?
When there is any failure in the starting and charging system, the entire system must be tested. Repair shops use professional test equipment that checks every component simultaneously and definitively. If the alternator is the problem, it will be identified.
How is an alternator replaced?
When replacing the alternator, the technician must remove the battery cables to prevent electric shock. The accessory drive belts or serpentine belts must be removed from the alternator, along with electrical connectors and several bolts. Once the bolts are removed, the alternator is free from the alternator brackets, and can be removed.
Replacement is in reverse order, and proper torque must be applied to prevent damage. The vehicle will then be retested.
RepairPal recommendations for alternator issues
Because the alternator requires the removal of the serpentine belt, this is a good time to replace that belt if it's worn, or the service interval has been reached.
If the battery cables have physical damage or extensive corrosion, they should be replaced as well.
What to look out for when dealing with alternator issues
On some cars, it can be hard to access the alternator, and that can play a significant role in the repair cost. In some cases, suspension components, drive axles, cooling fans and even bumpers must be removed.
If the vehicle has after-market electrical components installed, the new alternator should be strong enough to handle the additional power demands.
Can I replace the alternator myself?
If the alternator is tucked away and hard to get to, the replacement should be left to a professional technician.
If the alternator is more easily accessible, and you have a good understanding of the starting and charging system, you should be able to diagnose and repair this problem yourself.