Question about 2001 Isuzu Rodeo

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Brand new battery put in the car in the evening, by morning the battery was dead. Is there something that is causing the drain on the batter while the car is off?

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If your engine is a diesel then it may be the relay for the glow plugs which is shot

As long as the dashboard lights are off when you leave the motor at night there should be no drain effect if there is then you have a short on the loom or a coil

Only way to check it is to hook an meter into the circuit and see how much current is being drawn when the engine is shut off

You then need to unhook items like the starter motor and window motors even the alarm in a one at a time order until you see that drain stop.

Posted on Jun 25, 2009

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Check the battery voltage. If it's less than 12.2 volts, you've either got a charging problem or something is draining the battery. Read this post on how to find a battery drain.
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It could be a charging issue. But it could also be that something is draining the battery. To test the alternator you'll first have to charge the battery using a battery charger. Then follow this test.
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If the alternator passes, then conduct a battery drain test with this procedure
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My brand new battery is dead every morning. but a I can hear the alternator turn on. THere is a wire coming off the Hot terminal of the battery that is pulling a lot of juice. Im looking for a diagram


Large wire is possible hot wire to altenator. Should have B+ voltage at all times. Need to do an amperage draw test and start eliminating sub systems to determine root cause. Also would like to point out a new battery does not mean defective free. would load test to ensure no dead cells first.

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My 1994 Subaru SVX was having issues starting. We fixed the relay, and reworked some wiring issues. Now it starts, but the battery drains rapidly. I believe it to be the fault of the Theft Security System....


Rapid draining is usually caused by a shorted diode in the alternator. Disconnect it and see if the drain stops. The theft system would cause a much smaller drain and take overnight. But here's the way to track down a battery drain.

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My battery is brand new and my alternator is new both in good working condition but somehow overnight my battery drains.Even after a full charge in the morning i would have a dead battery. help me


you are looking in the wrong place. something is draining the battery while the ignition is off. replacing the battery and alternator is never going to fix this. you have to have someone troubleshoot the electrical system and figure out which doodad is killing the battery. usual
suspects are lights which aren't noticed as in the trunk and glove box, the anti-theft and door lock systems, remote start, clocks,etc.

One of those buggers is draining your system, you have to find it and kill it.
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My battery keeps draining down at night it's a 99 dodge durango


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

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Brand new battery dying quickly on my 1999 jeep cherokee. draw was not bad, but it only lasts about 4-5 days without being driven before it dies out.


Never saw an ammeter that had a "normal" reading on the gauge face...You aren't reading the dash gauge are you? Normal procedure is to place an ammeter between the battery and either lead and read draw that way. Then remove each fuse till the draw diminishes substantially. An alternator can draw a bit but it should not be excessive.
Checking charging volts, the meter should not read below about 12.5V even with all accessories on and should not continue to drop regardless of running time. (accessories off reading should be between 13 and 14V).
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Something is draining my battery


you need a mech you have a draw whitch meeans something is on at all times or internal short on something or pass bad batt.
make sure things ore off like dome light trunk light cig lighter out of socket cell phone charger etc. good luck

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