Question about 1997 Land Rover Range Rover

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If i leave the battery connected overnightit

If i leave the battery connected overnight it discharges all power .Could it be a problem with the alarm

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NO the alarm does not draw that much current for it to drain the battery. Look for a light bulb like the one under the hood or the glove box. The other thing to is if you have a rear wiper for the window, it's been know for the wiper arm not to return full back to it's neutral position due to corrosion at the shaft and the motor will draw current trying to pull the wiper arm back to the neutral position. Try pulling the fuse to the rear wiper motor from the fuse box and see if the battery stops draining. Good luck and hope this helps friend. 

Posted on Jul 02, 2009

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Absolutely. Alarm systems are the most common culprit for dead batteries (aside from dome lights left on).
This is probably the most obvious solution, but here it is. Recharge the battery and disconnect the alarm's power wire making sure it's not touching metal and shorting out. You might have to wrap the wire end with electrical tape. The other option is find the fuse for your alarm and pull it. Now leave it over night and check it in the morning. If it isn't dead, then it may be a short in the wiring for the alarm system drawing too much power.
If it is dead in the morning, then maybe it's time for a new battery.

Posted on Jul 02, 2009

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Battery checked and holds its charge when earth lead and live lead connected the battery will go flat overnight


Something is being left on to drain a battery that quickly, or the system has a dead short in it somewhere. The only drain should come from the alarm system and chronometer in the radio to keep the time correct. That will only drain a battery in about 6 months of not being charged from engine running. I've found the easiest way to check if anything else is still draining power is at the fuse box. With switch off, test each fuse to see if there is still power on them. Then pull the fuse that is still powered and see what isn't working now and the grounded system will show itself. Just leave that fuse out overnight and see does the battery drain down. if not, go thru that system and find the short or faulty unit it's connected to. I always go directly to the grounds to fix problems if something isn't working, yet with your situation, the ground is causing the problem the other way. Something is still connected that shouldn't be.

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What causes my battery to drain overnight? Parasitic (or ignition key off) drain is the cumulative load produced by electrical devices, for example, emissions computers, clocks, security alarms, radio presets, etc., that operate continuously after the engine is stopped and the ignition key has been switched off. Normal parasitic loads are below 75 milliamps (.075 amps). When the parasitic load is greater than 75 milliamps (.075 amps), batteries will drain more quickly. Glove box, trunk, and under hood lights that do not automatically turn off when the door is closed or shorted diodes in alternators are the most common offenders. Cooling fans, power seat belt retractors, radios and dome lights left on, alarm systems, and electric car antennas have also caused batteries to drain overnight. Leaving your headlights on will generally discharge a fully charged car battery, with 90 minutes of Reserve Capacity (36 amp hours), within a couple of hours.

It is highly recommended, especially if you are using a sealed wet "Maintenance Free" (Ca/Ca) battery, that you allow it to thaw if frozen, fully recharge it in a well ventilated area with an external battery charger, remove the surface charge, and load tested both the battery and the charging system for latent damage from the deep discharge. You could have a damaged or bad battery. If the alternator is warm and the engine is cold, then check for a shorted diode in the alternator.

Below are some methods that are used to test the parasitic load with the engine NOT running, under hood light disconnected, all accessories switched off, and the vehicle doors closed:
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  • A better approach is to use a DC ammeter, for example a Fluke 175, inserted in series with the negative battery cable terminal clamp and the negative battery terminal or a clamp-on DC ammeter, like a Fluke 336 or i410 around the negative battery cable. Starting with the highest scale, determine the current load. If the load is above 75 milliamps (.075 amps) after the initial surge, then start removing fuses or connections to the positive battery post one-at-a-time until the offending electrical component is identified by the parasitic load dropping to within 75 milliamps (.075 amps).

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Hi there,

Your question seems to be lacking in specifics but I think I know what you're looking for .

To completely re-set all systems on your car
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2. Disconnect the battery cables
3. Remove the battery and store it somewhere dry
4. leave the battery disconnected overnight
- This allows the capacitors to completely discharge
5. Re-connect the battery the next morning


Hope this is what you need!

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The car batteries are not like golf carts and are not deep discharge rated. (so can be damaged)
so charge the battery, if it wont hold a charge, it is bad.
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if is discharges , driving that is a engine charge system failure.
parked over night discharging is phantom discharging.
if the alarm goes off and stays in alarm , then dont use, it.
if the battery is happy with the alarm defeated then the Alarm is bad.

The battery measure 12.6vdc charged,(rested) "voltmeter"
and running measures, 13.3 to 15vdc at idle.

this one tool can solve this problem
http://www.walmart.com/ip/Equus-Innova-3721-Battery-and-Charging-System-Monitor/15137663

cheap.

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What I see here is " battery discharges if I leave it off overnight'
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Fix it!

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