Battery light on/no charge

[Spaz5spd]

I just finished dropping new motor in my car. With my motor that I blew I never had any issue like this, and didn't change anything about wiring.
while being jumped the car will fire right up and run sound, as long as jumpers are still connected. As soon as you remove one clamp the lights dimmed and gradually died off. Kept trying to figure it out. After a little while of trying we realized the battery light was even staying on while cables were hooked up. What would cause that? Brand new alt was put on cause original was junk. We triple tested new one at store, both used to work for AutoZone, so we know the possibilities of a faulty alt...but it passed all three times. What could be causing this? Is it the battery itself? I've yet to take it to get tested

 

[SICK SOCIETY DSM90]

I would get that battery checked out that's your best bet.

 

[grothe3297venge]

Check the battery and then look at all of the grounds

 

[silvreclips]

Obviously the battery is dead if he is jumping the car off, but once the car is running the ALT should be charging the car. Check your ALT fuses under the hood, make sure all the wiring is hooked up to the ALT and tight. With the car off check the back of the ALT for 12v, that will tell you if the ALT is even hooked up to the battery.

 

[SICK SOCIETY DSM90]

Ya its the battery its going to test bad at auto zone. If the battery is bad does not matter how well the alternator is working still will not hold the charge on the battery side. I bet a new battery and check all connectors for corrosion and functioning properly and you will be good to go. Very common problem with any car.

 

[GRAVEDIGGER]

Sounds like a bad alternator to me. They will test fine on the Autozone bench test, but will fail when on the car. I have seen it many times. A simple voltage check at the battery will tell you if it is up to par or not. If for some reason you are not getting any voltage at the battery you can check the power output right on the alternator. You should see at least 13.5 volts or so on a good charging system. If your alternator is putting out 12.xx volts that isn't going to cut it. 13.5-14.8 volts is what I like to see on most charging systems. Good luck!