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The most common cause of a battery not holding its charge is corroded battery cables. That is the end of the cable which connects to the battery. The battery has a post that sticks up and the cable ends in a hole. The hole in the connector is pushed down over the post and is tightened with a bolt on the cable end connector.
When this connection gets corroded, the higher resistance prevents the battery from receiving the normal amount of current from the alternator and so gradually it dies.
You can buy a gizmo at any auto store that is designed to clean both the post and the connector with the hole. One end does the post and the other does the hole.
BTW, I learned about this from my mechanic who always looked for the simplest explanation for a problem first, and thereby saved his customers a lot of money.
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∙ 11y ago
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How do you wire alternator to a battery to test alternator?
run it and then disconnect the negative wire from the battery if alternator dies its bad.
I have a 2003 Chevy impala how do i know if i have a bad battery or bad alternator?
To test the alternator if funds are low, let the motor idle and remove the negative battery cable, if the motor dies its probably the alternator.
If you unhook the battery in your 1994 acura legend should it stay running?
Why do you want to unhook your battery??? If the alternator is good the car will continue to run, if it dies then you have a bad alternator this is why you would want to unhook the battery cable to check and see if you have a bad alternator
Your car dies when you disconnect your battery what charging could you be having?
This could also be alternator problems as in a bad diode in the alternator.
87 Monte Carlo alternator is good still wont charge battery?
If the alternator is good then the battery is bad.
How do you check if my alternator is bad or my batter is bad in my car?
If the car won't start, jump it off. While it is running, remove the positive cable from the battery. If the car dies, then your alternator is bad. If it keeps running then you may have a bad battery.
Your battery dies when i drive but the battery light doesnt turn on what can cause this its a 98 Ford Escort ZX2?
probably have a bad alternator or voltage regulator or bad battery cables
MY car battery light is still on after the alternator and the battery has been changed. The battery cables are clean and well attached. Now what?
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. A replacement alternator can be bad. If it is ok than most likely a poor connection to the alternator.
Why car starts and runs fine then dies when stopping at a light or at all?
Possibly a bad alternator or battery.
How do you diagnose bad alternator?
Start the truck then disconnect the battery if it's still running the alternator is good
Remove positive battery terminal and car dies?
Yes it does. The alternator will only produce voltage if it has a battery supply. The battery power is used to create a magnetic field in the alternator. Spinning the magnetic field induces an electric field in the stator windings. Then the alternator can produce power to recharge the battery and maintain the electrical supply to the engine and ancilliary circuits.Take away the battery, no electrics, engine dies. Plus, it can also cause an electrical spike that could damage the computer.
If you disconnect the battery cable on your 1972 Monte Carlo and it dies does that mean th alternator is bad?
Generally, yes.
