How To Tell Bad Battery Or Alternator. Without the alternator your car battery will only last around 30 min to 2 hours. Then while the engine is running take away the negative battery terminal cable from the 12V battery.
If the car stops then you most likely have a problem with the alternator. Signs of a bad battery vs. Use the process of elimination to find out.
The quickest and easiest diagnosis to find out which one between the battery and the alternator is at fault is to use the process of elimination.
Therefore carefully following this cycle can help you figure out whether you have a battery problem or a bad alternator problem. Therere two easy methods to check if the key component is bad and its draining the batteries. If it works that may seem promising but the big question is can it start on its own. Amazon Affiliate Link to Battery Terminal Top Post Kit.
