We are having trouble with something draining the battery. I have to jump it to get it started but the battery would go dead (sitting or running). I was told from the dealer I bought it from that it was just the ctsy lamps draining it cuz they didn't always turn off. I fixed that by replacing the relay for the ctsy lamps. However this didn't fix my problem. I seems to be draining the battery running or not and why won't the new battery charge?when it is running it shows it is charging 14 volts but when it is off (not running) It shows no voltage on the gauge We put a new battery in and also replaced the alternator. any suggestions?
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your battery is being drained ,, check the plug in for the towing light hook up , something is shorted across ,, clean and tighten all connections to the battery ,, once the vehicle is running,, check the posts with a meter, you should get a reading of 13.5-14.5 volts, if not your alternator isn't doing its job
If you can jump start it and it stays running....I am assuming that you connect the Jumper Cable Ground to something other than your battery. If so, Your negative battery cable is suspect. Check both ends for ANY corrosion or loose connections.
Most likely you have something draining the battery. Quick way to tell, disconnect the ground (negative) cable to the battery, let it sit for a few hours, then reconnect it and try to start it. If it starts OK, you know the battery is holding a charge, but something is draining it. To drain it in just a few hours requires a serious draw, like headlights or the cooling fan. It is possible that your cooling fan (behind the radiator) is staying on all the time. Often they are controlled by a thermostat, and will run for a few minutes after you shut off the engine, but it should shut off within about five minutes. If it is still running after ten or more minutes, you have a bad fan thermostat or a bad fan relay. If that is not the problem, you will have to get someone with an ammeter to measure the current draw, and start pulling fuses until you find the culprit.
Several mechanics have looked at it, but has any automotive electricians......
what you have (sounds like) is a current drain.....what you need to do is disconnect the negative terminal from the battery and place a mutimeter in parallel,...(one lead on negative post on battery, and one lead on negative lead)...and set to current reading...it should be 0.05 amps or less...it will jump high first but will settle down.....if it is higher than this amount after a minute, something is causing a drain...
Now I have found that it could be something as a glovebox light not turning off when you close the glovebox, or interior somewhere....or it could actually be the alarm after all......
if you do find a drain, start pulling fuses to determine what might be causing it, if you pull a fuse out and the current goes from 1.2A, down to 0.05A, then you know which circuit could be at fault......
this sounds like you have a problem with the electric fuel pump sticking, that would be where i would look, when u turn the key on with the windows up do u hear a humming noise for about 3 seconds? if not the fuel pump is the problem.
I HAD THE SAME PROBLEM WITH MY 1999 GMC YUKON WITH THE 5.7 ENGINE HAVING TO JUMP START ALL THE TIME TO GET IT RUNNING, THE PROBLEM WITH MINE WAS THE FUEL PUMP HAD TO BE REPLACED, EVEN WHEN I REMOVED THE PUMP AND TURNED THE KEY FUEL PUMPED OUT BUT WAS NOT ENOUGH PRESSURE TO GET AND KEEP THE ENGINE RUNNING.I ALSO TRIED STARTER FLUID, THE ENGINE WOULD RUN UNTIL THE FLUID BURNED OFF.SO THE SOLUTION FOR MY TRUCK WAS THE FUEL PUMP AND NOW ITS STARTING LIKE A CHAMP