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2001 Dodge B3500 van mystery battery drain

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Old Aug 27, 2022 | 09:34 PM
  #21  
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Originally Posted by Busted Nuckles
Looks right to me. Did you verify your test procedure by measuring amps with a definite draw on the battery, say by opening the door and the dome lights come on? New but defective battery off the shelf?
Status: Discovered "new" meter was defective. Have a new meter now. Did parasitic test I get .13 Amps drain using 10A setting. Thats .13 amps.
I get 00 read using 500mA setting.
Did again with door open and dome light ON. Reads 1.1 Amp drain
Now with such a small drain why does battery fall to 8 volts in 2-3 days?
Should I do the pull-each-fuse test again, starting with the drain reading .13 amps ?

Did alternator charging test...accelerating in neutral gives me 14+ volts to the battery. Sounds OK.
Thanks everyone !

 
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Old Aug 27, 2022 | 10:43 PM
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Yes, I would now start removing each fuse one at a time and check amp draw after each removal. Shouldnt take long for that. Just because you show the alternator is charging doesn't necessarily mean it does not cause a drain when the vehicle is not running. Also do a good visual check to make sure a rodent has not been chewing on your wires. Now that you have a good measuring tool, your meter you should be able to identify the faulty circuit.
 
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Old Aug 30, 2022 | 04:57 PM
  #23  
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Did the fuse removal test. Overall battery drain is 13 Ma (.013 A) , with VERY slight fluctuations. Removed one fuse that dropped
drain down to 025 Ma (.025 A).
It was a 40 amp fuse for "Battery feed #2". (There is another fuse for "Battery feed #1...its OK) What is that??? I have no idea.
Repeated test 3 times, same result for this fuse. NOW WHAT???
Not done the alternator test yet, The service tech who installed new battery said he tested alternator...OK. Thanks for not giving up on on this mystery !!!
 
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Old Aug 30, 2022 | 05:16 PM
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OOPPPPS Sorry Incorrect numbers. Overall battery drain is .13 Amp. NOT .013 Amp. Sorry. All else OK. The .025 Amp is correct

Ive been told any drain (parasitic test) under 50Ma is standard and OK. So why is my small drain of .13Amp draining the battery so fast?
 
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Old Aug 31, 2022 | 05:19 AM
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Did you remove and test all the fuses on inside fuse panel or just the ones under the hood?
 
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Old Aug 31, 2022 | 06:53 AM
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If your ooooops is correct that overall drain is .13 amps, that is 13 hundredths of an amp which is far more than 50 thousanths of an amp. All depends on where you put the decimal point... Correct?
 
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Old Aug 31, 2022 | 08:27 AM
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Originally Posted by gbward55
If your ooooops is correct that overall drain is .13 amps, that is 13 hundredths of an amp
FYI, 0.13 is 10ths of an amp, 0.013 would be hundredths.
 
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Old Aug 31, 2022 | 09:53 AM
  #28  
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If you have a light in the glove box, remove the bulb to rule out a faulty glove box switch. You can also measure each circuit's draw by pulling the fuse one at a time and reading the amp draw across the 2 fuse terminals.
 
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Old Aug 31, 2022 | 11:15 AM
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tested all fuses both under hood and inside dash panel. Found a circuit that is draining battery.....see previous message
 
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Old Aug 31, 2022 | 08:09 PM
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Without a wiring diagram, I am guessing the Battery 2 wire powers a set of fuses in the inside fuse box, thats why I asked if you checked the fuses inside. I still think , just to rule out , you need to disconnect the alternator and check for drain, even though your mechanic said the alternator is charging.
 
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