Twin Leg Alternator For Toyota Landcruiser Prado GRJ120R 150R 4.0L 1GR-FE V6 02-15

What Causes An Alternator To Go Bad?

Most of the time, alternators fail as a result of age or use. 

However, some other factors can cause an alternator to fail prematurely. 

Fluid leaking on the car alternator can commonly lead to failure. Often, engine oil or power steering fluid can work its way into the alternator and cause it to malfunction or

fail. 

Your driving habits will also affect the alternator’s lifespan. For example, if you spend a lot of time idling while using many of your car’s accessories, it can put the alternator

under increased stress leading to more wear and tear. 

Finally, if the alternator is located near the bottom of the engine, there’s a chance it may be subject to water and salt intrusion. Both of these can get in and cause an

alternator malfunction.

Replacing an alternator

With all of your gear prepared, you can finally get started. Here’s how to change an alternator:

If your vehicle requires it, use a memory saver to back up its preset electronic data. See your car’s user manual for more information.

Disconnect the negative battery cable.

Find the alternator. They’re normally mounted to the front or the side of the engine.

Loosen the serpentine belt by springing back the belt tensioner with a belt tensioner tool. Pay close attention to how the belt is connected to the other components, because

you’ll have to reroute the belt around all of the engine’s pulleys when you’re finished. Review the belt-routing diagram for your vehicle if possible.

Remove the belt and scan it for any wear or tear, such as cracks or frays. Also check the belt tensioner to ensure that its roller still spins easily. If either component seems

worn out, replace it.

Disconnect any connectors or wiring from the alternator.

Unbolt and remove the alternator. You may have to delicately maneuver it around other parts of your vehicle.

Compare your old alternator to the new one. Make sure all of the connection ports and bolt holes match. If anything seems out of line, return the new alternator and get the

correct replacement.

Install the new alternator and reattach any connections.

Reinstall the belt, shifting the belt tensioner as needed. Once the belt is back in place, check its tension; it should have about ? inch of deflection.

Reconnect the negative battery terminal.

After your new alternator is installed, it’s a good idea to test it with a multimeter to see if it’s working as it should. If the voltage output is in the right range, you’re ready to hit

the road.