Can I fix a hidden draw on my battery by removing a fuse?
I'm pretty sure I have a hidden draw on my battery somewhere. Once I find it by checking with a meter and removing fuses,.. if it's something unimportant like the electric door locks, can I just leave out the fuse? Or will it somehow still draw on the battery?
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sounds like it could be a relay, but that is not normal, no relay should turn on just from hooking up battery power. Maybe it's related to your draw. I would go ahead with the fuses. Do you need a wiring diagram? BBB Industries has free wiring diagrams, every system, for every make and model. Once you have found the culprit fuse and circuit, you could check that circuit here: http://www.bbbind.com/technical.html
You might have a bulb lit somewhere, about the right amperage. Is your little rheostat dimmer for interior lights on?
Obviously you have a current draw from somewhere, and one of the easiest ways to find it, is to hook a 12 volt test light between your + battery terminal, and your + battery clamp. Just remove positive clamp, have one end of test light hooked to clamp, and the other attached to post of battery. As long as test light is bright, it's showing a draw. Then start pulling fuses from the circuits that you suspect may be causing the draw, like alarm system, door locks, etc. When the light dims or goes out when fuse is pulled, you found the circuit causing the draw, or one of the draws. Keep in mind the memory on your stereo will cause a slight draw for sure.
You can't check an alternator without running the car. I'd check for excessive system draw though by putting an ammeter between either of the battery cables and the battery and pulling fuses till draw diminishes substantially. then, track down the components served by that fuse. Your alternator can also draw if there is an internal problem usually with the bridge rectifier which short of a rebuild, can't be fixed (alt needs to be replaced) But I would not go there 'till everything else was tested. On the other hand, if you started the car once and immediately (within minutes) the car did not start (engine not turning) I'd look closely at all battery connections, ground points, relays and starter itself. To knock a new battery down that fast would require a massive short circuit or a system disconnect somewhere. I'd also make sure the battery has 12volts in it and can withstand a load test. even a new battery can be defective....not often, but it can happen. Also make sure if you have a security system it has not engaged and isn't just doing it';s job.
If the mechanic is saying that,so that it means the charge in the battery is being use somewhere when the car stay overnight.To be sure of that,i will advice you to make a simple test but its benefit knowing that,well take out the negative terminal of the battery,now rub the negative terminal to the negative terminal of the battery,while rubbing if you see a spark ,that means the charge is being use somewhere and must be checked and if not that means no charge is being used so confirm it,hope that clear your mind and help you
Assuming that the new battery is not defective and that the charge rate was verified at the battery, not just the alternator alone, you will need to begin by first making sure that any hidden lights are not remaining on (glove box, under-hood, trunk light etc) If they are good, then put an ammeter between either battery cable and the battery and check for system draw. After installing the ammeter, begin removing fuses one by one 'till the reading on the ammeter drops, then you will need to identify which system that fuse operates and check each of the components in that system to determine which one is causing the problem. Certain systems do create a small draw, such as the radio, which needs constant power for setting retention...you are looking for a draw larger than that. With a lot of patience and a bit of luck, you will find the cause.
Pull the neg. battery cable off the battery and connect a test light between the neg. cable and the neg. battery post if there is a draw it will light up. Make sure the doors are shut and ign. is off and start by pulling the fuses one at a time to see if the test light goes out(making sure to replace each fuse before moving on to the next one) if the light goes off then you have found the circuit that is pulling the draw, once you narrow it down it should be pretty easy to find exactly what is drawing the battery down.
replacing the battery will not fix the problem,,,there is a 2.5 amp draw thats killing the battery when the key is off,,,,what i would do is hook up a volt meter or test light between the negative battery cable and battery and then start removing fuses 1 by 1 and see which one makes the light dimmer,you may always have a draw but it should be below 1 amp (radio and stuff always has draw)then once you find out which fuse made it dimmer youre gonna have to see whats on that circuit that could cause it,,,,,very time consuming,,,,,good luck
Remove positive battery terminal from battery & put a 12 volt test light in line between cable & battery post. As long as 12 volt light is illuminated, you have a draw. Start pulling & re-installing fuses, one at a time,until you see it dim or go out. If it goes out, you found your draw. If it dims, slight draw, such as radio memory etc. if all else fails, make sure you know where they all go, then pull them all, and start putting back one at a time. When light comes on bright, you found the circuit causing the draw.