The diodes are the electronic part of the alternator that convert AC voltage to DC. Switch your multimeter to the lowest AC setting and reattach the test leads to the battery.

HOT ROD answers all your burning questions about how much it costs to replace an alternator, and what you need to know to diagnose and repair alternator problems.

Alternator Repair Cost In some instances, your faulty alternator might require minor repairs instead of a full replacement. You may need a new belt or to clean the electrical connecting points.

Alternator Repair Cost In some instances, your faulty alternator might require minor repairs instead of a full replacement. You may need a new belt or to clean the electrical connecting points. In ...

To keep you prepared for potential alternator failure, here’s a look at what it costs to replace one of these miniature power plants.

How Much Should an Alternator Replacement Cost? The average time for an alternator replacement is two-to-three hours. That gives you roughly $120- $200 in labor to start.

How Much Should an Alternator Replacement Cost? The average time for an alternator replacement is two-to-three hours. That gives you roughly $120- $200 in labor to start.

How Much Should an Alternator Replacement Cost? The average time for an alternator replacement is two-to-three hours. That gives you roughly $120- $200 in labor to start.