Can a bad battery test as being good?

Can a bad battery test as being good?

Batteries tested fine. Someone finally told me that while batteries can test out okay – they can lose some of their capacity for “cold cranking amps”. I replaced them and all was fine again. I keep my old batteries in my garage. I still work them like a dog for emergency auxiliary power sources when the power goes down during storms.

Can you use a 12V test light on a bad battery?

You can substitute a 12v test light, it obviously wont work as well, but it works. Be sure to test the bulb across both terminals of the battery first. Disconnect the earth cable, charge it, and leave the earth diconnected overnight. See if it’s still good in the morning.

Can a bad battery cause an alternator to over charge?

Make sure that all the connections to the alternator, remote voltage regulator (if applicable) and battery are clean, tight and in good condition. Check your battery or have it tested at your local auto parts store. A bad battery cell can cause the alternator to over-charge the good battery cells.

Can you test the gravity of a closed battery?

You cant test the specific gravity of the closed battery, and thats a drawback. If its a gel deep cycle battery it is probably OK, they are designed to be recharged afetr full discharge hundreds of times. Sounds like you may still have a phantom or parasitic load going on. Use a ampmeter to tell.

Is the alternator good or is the battery good?

Battery good, alternator good, brand new alternator cable… Q: Battery good, alternator good, brand new alternator cable, still not charging. I need help finding out what could be wrong with my charging system. One day my 2003 Expedition didn’t start, got a jump start and took it to auto zone to check.

What to do if your alternator won’t charge your battery?

Make sure you ground your multimeter, and put the power side to the stud that is coming out from the alternator (should be nut holding your wires that go to your battery). If your getting 13.5-14.5V there then the connection between the alternator, and battery is bad.

How do I know if it’s the battery or the alternator?

Both of these car parts control your electrical system. However, your alternator charges your battery while your battery supplies power to your car. The failures of a battery are sudden, while failures of a failing alternator are slow. Always check your battery first, it can generally tell you which of these two is the culprit.

What happens when a battery is left in a low charge?

Batteries left for in a very low state of charge for long periods of time can also experience the same changes, so although they can report being ‘charged’, the active materials inside and available to power devices are limited. (see Why do rechargeable batteries die for a full explanation on this process).