What does no alternator output mean?
The alternator isn’t charging the battery because of other problems on the vehicle like bad wiring connections, bad battery cables, a bad battery or a bad PCM. Poor ground connections are an often-overlooked cause of low charging output and alternator failure.
What controls the output of an alternator?
Explanation: Voltage regulator controls the output of the alternator. A voltage regulator is designed so that it keeps a constant voltage level.
How do I adjust my alternator output?
Selecting different sized diodes can alter the output regulation of the alternator. A smaller diode will increase the charge voltage by more than a larger diode (due to the voltage drop varying with the diode current).
What happens if you have a bad alternator in a Toyota Corolla?
As described above, a bad alternator will drain your Corolla’s battery fast. When the battery gets so dead it will no longer be able to power your Corolla’s ignition system. As the ignition system is no longer able to produce a full powered spark, the engine will begin to sputter and stall.
What should the voltage drop be on a Toyota alternator?
Photo 3: This alternator B+ to battery B+ voltage drop test indicates slightly less than 0.100 volts, which is well within Toyota’s 0
What causes a bad voltage test on an alternator?
Keep in mind that a worn or loose drive belt and other vehicle operating conditions like high temperatures can affect how the voltage regulator operates. When your test shows a steady or intermittent high or low voltage output, the voltage regulator is possibly bad.
What to do if your alternator is over charging the battery?
Ask an assistant to start the engine and hold engine speed at about 1500 RPM. Measure voltage across the battery with your DMM. You should get 0.5 to 2 volts higher than base voltage. If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty.