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 intermittent alternator failure in a Toyota?
The most common cause of intermittent alternator failure is when worn or sticking carbon brushes cause intermittent contact with the rotor slip rings, which is why I never rely on removing an alternator for testing on the part store’s test bench. Testing in-vehicle nearly always provides a definitive diagnosis.
Why does my alternator run when I Turn Off the car?
Generally, an OEM harness will not have the problem of alternator “run-on”, as there is usually a resistance wire in the dash harness to keep this from happening. Solution: To figure out where the problem exists, start the car and with the key in the ON position and the car running, turn off the key.
What happens to the charging amperage on a Toyota?
1. Charging amperage will rapidly decrease and charging voltage will rapidly increase on a badly sulfated battery. 2. The initial charging amperage should be high on a good battery. 3. Initial charging amperage gradually decreases as the charging voltage gradually increases on a good battery.
How many volts does it take to charge a Toyota battery?
For example, at 70° F, the voltage regulator charges the battery at approximately 14.2 volts. As underhood or ambient temperatures increase, the charging voltage is reduced to about 13.8 volts or less to prevent boiling the water from the battery electrolyte.
Why does my Toyota Tomorrows Charger not charge?
If the decoupler pulley fails, the alternator won’t charge because it is “free-wheeling.” Next, inspect the battery warning light to see if it illuminates as the ignition is turned on and if it turns off as the engine is started. If the battery warning light turns off with the engine running, accelerate the engine speed to 2,000 rpm.
What does it mean when your alternator stops charging the battery?
Indicator Light On. Usually, the first sign that your charging system is in trouble is a “battery,” “ALT,” or “CHARGE” warning light illuminating on your instrument panel while driving. It means that for some reason, the alternator has stopped charging the battery and your car is running on battery power.
How to know if your alternator is working properly?
1 Check the drive belt or serpentine belt. Look for signs of wear or damage like cuts, shiny spots or missing chunks under the belt. 2 Also, check the belt tensioner for proper operation and damage. It should rotate freely. 3 Make sure the alternator is properly mounted. 4 Check the alternator for noises.