Installing an Alternator

Author: Nationwide Autoparts   Date Posted:27 September 2017 

Installing an Alternator main image Installing an Alternator image

How do I diagnose a faulty alternator?

If your alternator stops working, your car will stop working too. Some obvious signs that your alternator is beginning to fail could be that the alternator light on your dashboard (if you have one) isn't lighting up, a loss of power when you turn on the air conditioning or the headlights, a low battery voltage or any strange grinding noises coming from the alternator.


How do I diagnose a faulty battery?

If your battery has failed your car will not turn on. If you suspect your battery may fail measure the voltage of the battery when your engine is off. It should read at least 12volts. Also, if your battery is more than 5 years old it has no doubt seen better days and needs replacing.


What different types of alternators are there?

Alternators are all the same. The only difference is those that have internal voltage and those that have external voltage. Other than, you only need to choose the alternator to fir your vehicles make and model. You can find the alternator to suit your vehicle at


How do I select which alternator matches my vehicle?

To select which alternator matches your vehicle, simply search for your vehicles make and model using our user-friendly searching navigation on our homepage. If you have any further questions you can contact our customer service team on 1300 529 723.


Can I install my new radiator myself?

Yes, but only if you feel confident to do so. Our Alternator Installation Guide may be able to assist you with your installation. If you do not feel confident we suggest you visit your local automotive specialist.


Should I change the battery when I change my alternator?

Your battery will only need to replace if it is faulty or possibly if it is over 5 years old.



Alternator Installation Guide

The following is a general guide to the removal and installation of an alternator. Some alternators are more complex to fit.



1. Disconnect the battery to prevent accidentally touching the positive wire onto an earth.

2. Once the battery is disconnected you can remove either the plug or feed wire on the alternator and the main positive lead (usually located at the rear of the alternator.)

3. Next you will need to remove the belt. Loosen off the pivot bolt at the bottom and undo the locking nut at the top. This will then allow the alternator to pivot and the belt should now be able to be removed. If you are removing the belt completely take note of how it runs over all of the pulleys.

4. Once the belt is off you then can remove the pivot bolt and locking bolts completely. Now you can remove the alternator.

5. Check that the new alternator matches the existing alternator. Swap over any extra brackets or parts from the existing to the new.

6. To install your new alternator, follow the above procedure but in reverse order. Refit the alternator, refit and tension the belt, reconnect the wiring and start your car.