Why does my car battery have no power?

No starting, no clicking sound, nothing. As soon as I disconnected the battery charger, the internal lights went off. So I’m at a loss. It seems like if the battery weren’t making a good connection, then hooking the charger up wouldn’t power the internal lights.

Can a car battery be disconnected while the engine is running?

Battery voltage MUST be maintained to the (PCM) and other modules; while the battery is disconnected. NEVER : disconnect the car battery; while the engine is running or the ignition key is turned on. Automotive Car Battery With Negative Cable Removed

Can a car battery drain with the negative cable disconnected?

Leaving the battery hooked up will drain it at 20% or more per week! In this article I’ll dive into how a car battery will still lose some of its charge despite disconnecting the negative cable and best practices for keeping your battery ready to go when you returned to your vehicle.

Why does my car light go off when I charge the battery?

As soon as I did this, the interior lights came on. The battery charger said that the battery was fully charged, but when I turned the key, nothing happened. No starting, no clicking sound, nothing. As soon as I disconnected the battery charger, the internal lights went off.

What happens when you remove cable from car battery?

Removing Cable From Car Battery So, disconnecting the car battery to reset the (PCM) on late model vehicles; can do more than just erase the keep alive memory. It can also erase vital learned information that is; absolutely necessary for other modules to function normally.

What should I do if my battery won’t start?

You might try cleaning the battery connections along with the battery to chassis ground connection to see if that makes any difference. If the gauges are controlled by a BCM module then there may be a problem with it. By pulling the fuse for the memory power to the module that would reset it and possibly verify the trouble is with it.

How to disconnect a car battery to reset the computer?

Different cars will have different procedures, but with most, just driving the car will do the trick. If you use the baking soda mixture instead of cleaner, mix 1 tablespoon of baking soda into 1 cup of water. Thoroughly rinse the battery with clean water to remove all of the solution.

Why does my car not start when I turn the key?

There are a lot of ways the cars can not start. One of the most annoying ways is when you turn the key and nothing happens. Also, you may have just changed the battery and have no reason to believe it is bad.

Why does my Jeep not start when there is no power?

There is a wire that goes to the power distribution box on the finder close to the battery, if you don’t have power to it nothing will work. Could be a dirty connection there or there is also a large main fuse in the PDB that supplies power to all circuits in the jeep. I would check the fuse box for problems.

Why does my lawn mower not start when there is no power?

As you can see in the schematic, the only thing between the battery and fuse is a couple of battery cables. If no power is even reaching the fuse then one of those battery cables/wires is not making a connection. Remember that power needs a ground to complete the circuit, so the issue could also be in the battery ground cable.

Why is there no power when the key is turned?

When that dead/dying battery was in place, the lights would power on dimly while the key was on, and I would hear a clicking sound while trying to start it, but it would not turn over. The battery was tested and needed to be replaced. Now, with a new battery that has been tested to be good, I don’t get any electrical power when turning the key.

Is there no power from battery to key switch?

1986 TRX 350 4×4: With the battery charged and connected, there is no power to the front end. Turn key on, no indicator lights such as the green neutral, no headlights. All worked last fall when put away for the winter.

Why does my ATV have no power when I turn the key?

When I installed the new battery, I didn’t noticed that there were two positive cables that need to be connected to the positive terminal. One of them had slipped back into the boot, and I only connected the other one. This is why the ATV had no power at all when I was turning the key.