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#1
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Am I checking battery draw correctly?
I have a drain overnight....Trying to figure it out today.
Battery holds charge overnight when disconnected from the system. 12.68v held for over 10hours. Engine running gets me 13.88v (battery was low during this test...not sure if that affects readings or not). Load tested battery and looks OK right? : Then I checked draw, but 9mA seems far too low...Maybe I am doing something wrong here? I have my DMM set to COM and 20A. I'm relatively new to all this type of stuff. Thanks, Robert
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#2
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On some meters the red probe has to be moved to a different hole. I don't know about that meter. Otherwise it looks like you are doing it right. You could try the mA setting also.
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra |
#3
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I have the probe in the 20A socket...so it is in the right place.
I just thought that I would be seeing more then 9mA? Maybe I have an intermittent drain?
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#4
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Ok did some more testing. Here is where it gets weird:
Engine ON: 13.95v Engine ON + A/C: 13.82v Engine ON + A/C + Radio/Amp/Sub high: 13.70v Engine ON + A/C + Radio/Amp/Sub High + Lights: 12.65v Engine ON + A/C + Lights: 12.8v Engine ON + Lights: 12.89v Engine ON + Lights + Fogs: 12.80v I think this issue is to do with the lights....My warning bulb dummy light is on, but I thought that was something separate...maybe it IS in fact related? Any ideas?
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#5
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I can't see how you've connected the leads. An Ammeter must be connected in series. Set up your meter for Ammeter with leads in the right connectors. Remove a battery cable from the post and put one lead on the battery and the other on the post. This puts the meter in series. Then with everything turned off, see how much current it draws.
Hope this helps. |
#6
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That is how I have it set up.
DMM(+) on the (+) battery terminal, and the DMM(-) on the (+)battery cable. DMM Probe leads: Red = 20A and Black = COM Everything should be in series. Either way, why are my lights taking such a huge hit voltage-wise (over 1.0v), yet no other accessories affect it by more then 0.20v? Does this indicate a failing alternator, or some sort of excessive electrical draw problem in the lighting system?
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#7
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Read this thread http://www.peachparts.com/shopforum/showthread.php?t=268191 It may help. You should remember it! You weighed in there.
When are you gonna make it to one of our drag strip days? The next one is in Sept.: http://www.peachparts.com/shopforum/showthread.php?t=251933&page=9 Regards, Eric
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89 300E "Benzer1" 15.924 Uncorrected 93 400E "Benzer3" 14.200 U.C. 95 E420 "Benzer4" 92 300E "Benzer5" 16.299 U.C. Future turbo CNG 87 300D "Benzer7" 87 300D "Benzer8" 87 300D "Benzer9" 87 300D/70 AMC Javelin "Sidewinder-Benzer" 87 300TD "Benzer11" 06 E320 CDI "Benzer12" 05 E320 CDI "Benzer12A" 71 AMC Javelin AMX 401 "Sidewinder" 74 AMC Hornet 401 "C.K.10" 13.63 U.C. 74 Bricklin SV1 "Presto" AMC 360 pwrd. Last edited by 400Eric; 07-24-2010 at 02:26 AM. |
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