Alternator and Starter Diagnosis
Rotating electrical parts such as starters and alternators often have to be replaced on older, high-mileage vehicles. Fuel injection has helped prolong the service life of starters by allowing engines to start more quickly when they are cranked. Such is not the case with alternators. Higher electrical demands on charging systems have increased alternator failures.
How do you tell if a battery or a starter is faulty?
Alternators on their way out have been know to back-drain a battery overnight as well so if the problem persists have your electrical system tested to see if there is a drain on the battery after the vehicle has been turned off.
Top 10 Signs of Alternator Problems
Use caution, however, as a dying battery can only receive a charge for so long and may go completely dead at a later point despite the best efforts of the alternator. You can test the battery with a voltmeter, and most auto stores have the facilities to check a suspect battery, usually free of charge.
You depend on your car to get you where you need to go, so when it doesn’t start, it can be a pretty big problem. There are a number of reasons why this might happen, but one of the most common is that it isn’t getting enough electricity to start the combustion process. You may be tempted to blame the battery — and you might be right — but alternator problems could also be at fault. How do you know if it’s the alternator or battery? Knowing the difference will let you make a quick diagnosis and the proper repairs.
What Happens When It Starts Dying
Last, but certainly not least, if you have a vehicle that is newer than a 2001 model, you might have an alternator that is controlled digitally by a "brain" (computer). In this instance, the brain can sometimes be at fault for an incorrectly operating alternator. This is not a very common problem, but it is easy to diagnose—simply use an OBD II Code Reader.
My Car Won’t Start: Is it the Starter, Alternator, or Battery?
Usually when your car doesn’t start right up, you may immediately suspect that the battery has died. This isn’t necessarily true considering there are several different parts that are involved in starting your vehicle. To help you determine whether the starter, alternator, or indeed the battery are at fault, let’s take a look at each of their roles and what could occur to indicate which element has failed.
car randomly wont crank. alternator, starter and battery good
Hello, I am having the same problem with a 2000 Mercury Gran Marquis 8cylinder engine. My mechanic tested battery, starter and checked the ignition switch but car still would not start. He connected a wire from the starter directly to the battery and the car started.
If you are hearing a stuttering when your car is trying to crank over, you may have an issue with your starter. Usually, when your starter is the issue, your car will crank but not start up. However, if you are dealing with a dead alternator or battery, you will only hear a click when you turn your key.