How to replace an alternator

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					   How to Replace an Alternator on a 2003 Honda Accord 4 Cylinder
With the tough economic times we’re in, we are always looking for ways to save money
when possible. Doing your own maintenance on your vehicle is a great way to save a
dollar and help get more miles and years out of your vehicle as well. Most people know
that changing your engine oil every three to five thousand miles will prolong the life of
your engine, but when the electrical system doesn’t work properly most of us do not
know what to do. The first and only thing most people do is check the battery. When the
battery checks ok, people usually give up or bring it to a mechanic to get it fixed.
Professional diagnosis usually leads to extra labor cost, which can run from $60/hr or
more. These instructions will show you how to do a little more of your own work and
help teach you a few things of how your vehicle works that you might not fully

There are a few places such as AutoZone, Pep Boys, and O’Reilly’s that perform free
battery and charge system test. By using their free service, you don’t have to purchase
any extra tools or equipment to perform these tests. If a charge system test reveals that
the alternator is not providing an adequate charge, then you’ll need to replace it. The first
thing to do is purchase a new or remanufactured alternator for your vehicle, which can be
purchased from one of the auto parts stores previously listed. The advantage of
purchasing the part from an auto parts store over a dealership is they are usually
considerable cheaper (approximately $50-$150) and the warranty of the part is usually
longer. Original manufactured equipment (OEM) parts only have a limited time
warranty; where as the ones from an auto parts store sometimes have a lifetime warranty.

Parts Required
- New/Remanufactured alternator  $160 +$56 core (
- Metric 3/8 socket set 8mm-19mm $20 (
- 3/8 Ratchet                    $9 (

WARNING: Remove all metal jewelry before working on electrical devices, due to
possible injury or death.
Steps to Replacing the Alternator
  1. Disconnect the negative cable from the battery, and then disconnect the positive

  2. Remove the drive belt.

                              Figure 1: Removing Drive Belt

                                Source: Honda Motor Co. Service Manuel.

  3. Remove the power steering pump without disconnecting the hoses.

                        Figure 2: Power Steering Pump Removal

                                Source: Honda Motor Co. Service Manual

  4. Remove the auto-tensioner.

                      Figure 3: Drive Belt Auto-Tensioner Removal

                                Source: Honda Motor Co. Service Manual
   5. Disconnect the alternator connector and wire from the alternator.

                       Figure 4: Disconnecting Electrical Connections

                                  Source: Honda Motor Co. Service Manual

   6. Remove the three bolts securing the alternator, then remove alternator.

                        Figure 5: Removing the Alternator Assembly

                                  Source: Honda Motor Co. Service Manual

   7. Install the alternator and drive belt in the reverse order of removal

   8. Connect the battery positive cable and negative cable to the battery.

Benefits of Replacing Your Alternator
Being able to replace your own alternator when it is necessary can save you money and
give you a better understanding of how your vehicle works. This easy repair can also
help add years of worry-free driving to your vehicle, which will also save money by no
extra car payments or higher insurance usually associated with a new vehicle.

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