alternator for my car
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Alternator for cars
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Replace a Spare part Alternator – a defective one or if the limit of use has been already reached. Find out useful information about Alternator
A simple testing of an alternator can be done without removing it, but just using a multimeter. For this you should:
- Connect the measuring device to the battery terminals observing the polarity. When the engine isn’t running, the voltage should be between 12.5 and 12.7 V.
- Start the engine without turning on any power consuming devices – normally the voltage should increase to 13.8–14.5 V.
- Increase the load on the battery by turning on all car systems with high power consumption, for example, the air-conditioning, lighting, heated seats, and so on. The voltage should drop to between 13.7 and 14.0 V.
- Make sure that the component doesn’t produce sparks, its housing and wires are not damaged, and that the drive belt isn’t worn out.
A more accurate diagnosis requires the part to be removed. For this, disconnect:
- The negative battery terminal;
- Battery and fuse wires;
- The drive belt.
Next, remove and disassemble the component. Measure the resistance of the rotor and stator windings using the multimeter. Check the resistance of the alternator's diode bridge as well, by attaching the multimeter probes to the diodes and the rectifier plate. Afterwards, swap the probes around and repeat the procedure. Compare the recorded values with those specified by the vehicle’s manufacturer.
The exact procedure will depend on the vehicle’s make and model. Detailed instructions are usually provided in the car owner’s manual. You will need electrical skills to be able to replace the brushes, the clutch, a rotor bearing, or the diode bridge yourself. If you need to install a new component, follow these steps:
- Disconnect the negative battery terminal.
- Remove the alternator drive belt.
- Mark or remember the wires that are connected to the battery and fuse box.
- Remove all components that prevent access to the part.
- Remove the wiring having unfastened all of the clips.
- Remove the alternator.
- Install a new part by following the instructions in reverse.
Clean the part periodically with compressed air and check the tension of the drive belt. Ensure the parts are all tightly fastened and lubricate the bearings. Replace the brushes if they are worn out.





































































