(1997 GMC Jimmy) Battery will randomly start loosing it's power and not have enough juice to crank it over, At times it will fire up just fine, sometimes it will have enough juice to turn it over for half a second and will begin just clicking, and sometimes its so dead it doesn't light anything up when i open the door or put the key in...Just bought a brand new battery ~2 months ago, alternator has been tested and is working fine...We think something is drawing power from the battery when it shouldn't be, but we can't find the problem.
I would check for a draw. You can do this by disconnecting the negative cable from the battery and hooking a test light from the cable to the battery. The light will be on if something is taking power off of the battery such as, dome light, glove box light, radio ect. make sure to have doors shut and everything off when you do this so it wont give you a false reading. If the light is on, you have a draw. if it is off you dont have a draw. Then from there you can figure out where the draw is coming from by opening the drivers door and accessing the fuse panel(OPENING THE DOOR WILL KEEP THE LIGHT ON BECAUSE IT WILL OPEN TH ECIRCUIT FOR THE DOME LIGHT, YOU CAN TAPE OR HOLD THE SWTICH INSIDE THE DOOR JAMB TO CLOSE THE CIRCUIT)when you access the fuse panel you can pull each fuse 1 at a time until the light goes off, when the light goes off. check what the fuse is for, that is where your draw is coming from. Common draws come from a faulty radio or glove box light stays on.
Did you nmake sure terminals were clean and tight if not battery will not charge properly.Also I once boughjt a brand new sears diehard and had problems with it after a month they replaced it with no question but my point is sometimes new batteries can be defective too.I would get battery load tested asap
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