Alternator Repair Costs

Cost of Replacing the Alternator

Because this is the easier of the two, we'll go into it first. The cost of a new alternator varies by vehicle make. Average is about $100 or so for 4 cylinder engines and $150 for 6 or 8 cylinders.

Most mechanics can install a new alternator in about half an hour and most home DIY mechanics can do it themselves.

A rebuilt alternator can be purchased for about half the price of new, but may not have the same warranty as a new unit. The cost savings often makes it worth the risk, however, and most will function as if new.

Cost of Repairing an Alternator

Most mechanic's shops will not repair alternators, but will replace them with rebuilt ones, which amounts to the same thing (see above).

To repair an alternator yourself will cost between $15 and $30 for the brushes and to do a full rebuild yourself may cost close to $50, depending on the type. Most repairs done at home in lieu of purchasing a rebuilt are just brush replacements.

A few specialty tools may be required, but brush replacement can usually be done in 1-2 hours by most mechanics. The extra time is mainly in the care involved in opening the alternator's case and replacing the brushes so that the new ones are not bent or dirty.