I have a 99 eldorado. The battery keeps draining overnight. Have taken every fuse out and checked. Finally when I took it to amos and checked one of the super fuses took the amp meter down to zero. Is this the problem? Any more suggestions on where to look?
This all started happening after I had taken it to get A/C fixed and they said they had to replace a wire that was broken in AC system. Shorly after getting that fixed the ABS light would come on and traction control would have to be manually disengaged upon turning on while making a turn from a stop sign. None of the wheel sensors are bad.
Helo Im about to pull my hair out and know it might cost me a fortune if I take it to the cadillac garage
I had the same problem the day I bought the car. My batter was acting weird. Attempts to jump start it resulted in the hood popping open, a buzzing sound underneath the real seat, and my fuel door popping open!
After all of this It turns out the cable to the battery terminal was defective and it was draining the battery and causing these other issues. They changed the red cable and the issue went away.
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You need to disconnect the battery negative lead and place an ammeter between battery and lead, note the current draw with every thing switched off, then start removing one fuse at a time from fuse box and see if ammeter drops significantly if not refit fuse and remove the next one and repeat this until you find the one that causes a significant drop, then you will have found the circuit that is draining the battery, you need to check this circuit to find cause of power draw and repair as required, let me know how you get on
My tip is for all makes and models of vehicles
It is a common fault these days are more and more extra fittings are loaded to the cars and when proper precautions are not taken it will end up to fault the system. Hence in case of a battery drain overnight try these checks.
You must check the drain current on your battery after the engine is switched off. The best way to check this out is to connect an ammeter in series to the battery and check. There can be a permissible limit of few milli amps but a large drain can in about 12 hours ( overnight) fully drain the battery no matter how much you have charged it or the system charged it up. Now disconnect one by one the circuits to centre on the faulty circuit and then the faulty device. This is easy as the fuse can be pulled out one by one till the ammeter reading drops down. Now it is always possible that directly connected circuits like Clocks, audio/video systems, remote control units , brake lamps park lamp circuits can be possible problem areas. After the device is identified and battery must be charged up fully and tested overnight.
If the alternator is charging the battery, and it goes dead overnight, you have a short to ground in the wiring that is draining the battery. You can try disconnecting the negative battery cable and see if the battery stays charged when the engine is off. If it still goes dead, the battery could have a dead cell.
First step have the battery tested, a bad cell can cause a internal drain and kill the battery, if the batt is ok then check for interior lights like visors that stay on or interior light that come on by themselves at night due to defective door switches.
I have done this before, put about a 10 amp charger on the battery. Pull the courtesy light fuse first. Look at the battery charger, it is probably charging several amps, pull one fuse at a time. When the charging amps drops down you found the fuse the controls the problem. I had a car several years ago that someone pulled the seat belt all the way out, somehow it was pulling a load and draining the battery overnight.
Are you sure that you have a problem with something draining the battery, or do you have a problem with the alternator not charging the battery? I would have the alternator tested to make sure of that before spending hours and hours troubleshooting electrical problems.
Basically, to check a problem like this you will need a clamp on amp meter. Then you pull fuses from your fuse panel and see where the drain is. Make sure you have a good layout of your fuse panel and fuse sizes (a digital photo is also a good idea) before starting, so you don't introduce problems.
ECM. Pull fuse # 3 from fuse box and charge battery.....leave vehicle overnight and see if starts in morning. I own 92 and ECM went out. Expensive to replace and has to be exact fit. My battery stopped draining after removing fuse!!!!!!!!!!!
you have something draining the battery,check for any lights that might be staying on,interior light,stop light under the hood light(if any),glove box light trunk light, if you have a multimeter with amp testing capability or an amp meter you can check where the drain is by removing each fuse & put the probes on each side the terminals until you find a drainage,that way you might be able to find out what is draining the power & rectify it......hope this helps......cheers