It should be hot at all times. You can easily test the voltage by connecting a voltmeter to your battery while the engine is off.
The alternator is connected to a set of belts which when loose can cause it not to function as required.
How to fix an alternator that wont charge.
Check the 4 pin connector for secure connection.
A charging system voltage drop check can help you locate the source of an under charge or over charge condition due to problems in the wiring or connections between the battery and alternator.
You can automatically assume theres a battery problem when the reading is lower.
First turn off the engine and check the battery voltage.
Turn it to dc volts put your leads on your battery with the car running if your alternator is charging it should read from 135v 145v thats a good charge.
Use your multimeter if you dont have one get one.
This video shows you how you can repair a faulty alternator with a 25 replacement component.
If your not getting a reading from there you can check your output from your alternator.
Alternator is good but not charging due to missing power supply.
Start the engine and let it idle.
There are a few possibilities.
The most common reason for an alternator failing to charge a battery is one of them going bad.
To differentiate an alternator problem from the battery you will need to use a voltmeter to check for voltage.
You can buy alternator repair kits and fix your own alternator for a fraction of the price of.
The alternator converts mechanical energy into electricity.
The voltage reading should be between 12 and 13 volts.
Plus you must wait a minimum of 5 seconds after turning the key to off before removing any connector.
If you dont and run into an alternator wont charge condition youll have to buy a new pcm.
Test to battery voltage at the main mast.
Maybe there was an error with the benchtest.
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