Is my alternator a smart alternator?
If your readings are around 14.4V DC then then you most likely have the traditional, non-smart alternator. If your reading is closer to 12.5-13.5V then it’s likely that you have a smart alternator. If you do happen to have a smart alternator this isn’t an issue.
How do you test a smart alternator?
The usual way of testing these units is to apply a multimeter across the battery terminals to check that the voltage does not dip above, or below, 13 volts. This should be checked with and without the headlights, heated rear windscreen and interior fan switched on – the reading should remain fairly consistent.
What should the voltage be on a Volvo alternator?
It should be stable when idle and a steady 14 volts or near enough when running. A high or low voltage could turn on the check engine, ABS and other lights. After the charging system on this Volvo is thoroughly checked all codes should be cleared.
What to do if your alternator is over charging the battery?
Ask an assistant to start the engine and hold engine speed at about 1500 RPM. Measure voltage across the battery with your DMM. You should get 0.5 to 2 volts higher than base voltage. If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty.
Can a high voltage alternator turn on the Check Engine?
A high or low voltage could turn on the check engine, ABS and other lights. After the charging system on this Volvo is thoroughly checked all codes should be cleared. If an aftermarket alternator has been used it should be replaced with a genuine Volvo part or a quality alternator like one made by Bosch.
What should voltage of alternator be when idle?
The voltage output of the alternator might vary and would need to be checked. It should be stable when idle and a steady 14 volts or near enough when running. A high or low voltage could turn on the check engine, ABS and other lights.