What causes the alternator to run nonstop?

Hello Paul, I want to buy a used Subaru legacy GT at Shs6m. However, the alternator runs nonstop thereby over charging the battery. Could there be other issues for this car to be this cheap? Kon. B.

Hello Kon, does the Subaru start and run? Take it to a garage for inspection by a qualified car electrician. A voltage and alternator tester can be used to confirm the status of its alternator.

You may also need to replace that Subaru’s alternator. It may have a faulty regulator which is not easy to repair due to unavailable spare parts.

Occasionally, a wrong type battery can cause an alternator to overcharge, especially in newer type vehicles built with battery control module.

To confirm if that Subaru is worth the Shs6m, check the condition of the engine lubrication system, get an engine compression test to confirm that it does not burn oil. Also, check the automatic gearbox too. A road test is a good idea to get a general feel. Rule out major accident repair.