My battery died overnight sometime it might take two night i disconnect the negative cable last night left it off the battery volts was 12.25 so i check the volts this morning it was 12.09, when the engine is running the volts is 14.7 could it be something wrong with the battery how do i fix this problem?
Fully charged your battery should measure 12.6 volts or higher. So based on you data, your battery is a little weak. Not sure how old it is or what brand, but as the battery ages it weakens. I suggest you first make sure the terminals are freshly cleaned using a terminal cleaner and then take the vehicle it to any parts store and they will load test it for free. Good luck. Hope this helps
Your charging system seems to be working fine you more than likely have a weak battery as small drop overnight is no big deal but if it's going completely dead with the cables hooked up then you probably also have a drain on your System need to have a voltage drop test
No should not leak down...To be sure load test the battery and verify the battery is good. If it is defective all you can do is clean cables and replace the battery.
Rinse off the battery top with water and clean the battery terminal connections at the battery. Disconnect both cables after you get it charged up and see what happens next.
SOURCE: When accelerating alternator light comes on.
Possible loose or worn alternator belt. Check the condition of the belt. If it's worn, replace it. If it's just loose, tighten it up.
SOURCE: 1996 tahoe won't start
double check battery under load and verify it will hold for 10 seconds without dropping out under 10.5 volts , very possible there is a draw somewhere , check this by pulling fuses one by one with amp meter connected until you see maybe .3 volts .1 volt is normal
SOURCE: h2 battery runs down overnight
sounds like a short circuit, check any aftermarket items first, a slow but easy way is pull on fuse at a time and check current flow from battery un til it stops, when it stops check fuse and see which system is draining
SOURCE: My engine died. There in
Leave the battery disconnected and charge it for about 8-hours with a low-rate charger. Make sure all switches are off, then tap the battery cable back to the post--if you get bright flashes/sparks, you will need to isolate various sections of the wiring by removing fuses and remove the heavy wire going to the alternator. Once you get it to where there are no sparks, push the connector on to the post (but don't tighten yet), start replacing fuses and wire connections one at a time until you find one that sparks--that is the circuit that you need to trace out. If it is the alternator wire, have the alternator tested at an auto parts store. If you got no reaction when replacing the negative cable to the post after charging, a switch may have been left on thus draining the battery. Hope this helps!
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