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Discovery2 - Need help with sudden battery drain

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  #1  
Old 02-21-2023, 10:24 PM
TejasRover's Avatar
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Default Discovery2 - Need help with sudden battery drain

Hello all

This is my first post, up until now I have always been able to find my issue and fix it with the forum so well done creating a wealth of knowledge.

I have an ongoing issue with my 2001 Land Rover discovery2 where the battery will drain within a matter of 15 min when it was other wise working and charging as it should as far as I could tell with a Bluetooth battery monitor.

I have recently replaced the battery and had the alternator rebuilt which seemed to fix the charging issue I was having. (Voltage reg was bad) the only thing that is a common factor now for the voltage to drop is the use of the air conditioning system. After I have turned it on for anywhere from 15-45min the battery will drop from around 14 volts to ~11 volts. When I turn the ac on it will drop .3 or .4 volts and stay that way.


turning the AC off does not allow the car to recharge the battery but it is probably too low at that point

any ideas what could be causing this or are these not likely connected?
 
  #2  
Old 02-21-2023, 10:55 PM
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That sounds like the alternator, when you fire up the the AC that adds extra drag on serpentine belt. All thing being equal you will see a bit of a drop, as the clutch kicks in and the internal blower fanis running. My Disco will drop form 13.6 to 13.3 -fan on high, it returns to 13.6 + as soon as the AC is turned off.

But it could be something else - including the battery.

Start simple:

Start your truck and check the voltage output at the alternator with a multimetter it should be out putting around14.0
Turn everything on except the AC,stereo, head lights on hi, hazards, heater on max fan, fog lights if you have them
Now you should be running around 13.4 to 13.6 possibly higher depending on battery state
Finally switch the A/C on you should still be above 13. volts I run at 13.3 in that state - on an old alternator
 
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Old 02-22-2023, 08:46 AM
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Procedure
  1. Step 1: Prepare for Test. You should have a fully charged battery before starting – voltage would be around 12.6V for a good one. ...
  2. Step 2: Disconnect the Battery. ...
  3. Step 3: Connect the Multimeter. ...
  4. Step 4: Give the Car Time to Sleep. ...
  5. Step 5: Reading the Meter.


go on google and learn how to do a parasidic draw test, its easy
 
  #4  
Old 02-22-2023, 09:43 AM
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Well, that's ugly.
 
  #5  
Old 02-22-2023, 09:46 AM
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Bring it to any auto parts store (if you can get there) and they can run a battery and alternator diagnostic for you. But based on your description it certainly seems like an alternator problem. I have found that rebuilt alternators have a pretty high failure rate so I wouldn't be surprised if that was the issue.
 
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  #6  
Old 02-22-2023, 09:49 AM
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easy to determine with the parasidic draw test, take amp draw, if its drawing amps disconect altenator if draw goes away its alternator, how is a parts store going to check your alternator ??????
 
  #7  
Old 02-22-2023, 09:57 AM
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@redwhitekat Auto parts stores do a load test on the alternator and check both output voltage and amps. But his description sounds like a voltage drop while running - once the A/C is engaged makes it way worse.

 
  #8  
Old 02-22-2023, 10:16 AM
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For those wondering...The giant block of swearing above is actually an image that is base-64 encoded: Here is the picture if you decode it:



 
  #9  
Old 02-22-2023, 11:44 AM
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Originally Posted by Richard Gallant
@redwhitekat Auto parts stores do a load test on the alternator and check both output voltage and amps. But his description sounds like a voltage drop while running - once the A/C is engaged makes it way worse.
really ? well around here its hard to find a parts guy that actually gets up out of their chair to check something, let alone come out to your car lol
 
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  #10  
Old 02-22-2023, 11:52 AM
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@redwhitekat yea same here - pretty have to go to small good shop for that - but parts stores used to do it in BC.
 


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