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Battery drain
I have an 1987 mercedes 420 sel ---i put a meter on the neg. cable and battery terminal and its shows 0.10 draw on the battery i guess that would be milimeters, is that enough draw to lower my battery that it won't start after a week or so of not being used ??
Thanks jlw15 |
#2
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It depends on what scale you had your meter set to.
If you had it set to 10A, then that means 100mA.
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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Yes meter is set at 10A
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#4
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when alternator go bad sometimes they will draw power..I had to replace mine
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#5
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A 100mA draw shouldn't kill a healthy battery in just a week. The normal rest current draw for that car is at least 50-60mA so you're only looking for a 40-50mA problem. Star by removing the fuses one at a time while watching the meter.
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#6
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Try removing the clock fuse to isolate the leakage . Leaky capacitors in these clocks are common .
good luck Adler |
#7
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so what your saying is if my meter is set on 10A and reading 0.10 that shouldn'r be a problem???? i pulled all fuses from fuse box from under the hood except the square silver ones and nothing changed on my meter---not sure where to go from here
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#8
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I just have a cheap meter that will read 10A ---other day i opened the door to check meter was working and it did show about 1.30 when door was opend---had a load test done on battery and it showed to be good
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#9
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1.3A draw with doors open sounds correct. I'll check my 420SEL in a bit here and see what the battery drain on it is..
Edit: Here you go. Looks like 20mA is the nominal draw on the battery. You've got something extra pulling power.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k Last edited by JamesDean; 03-18-2012 at 08:24 PM. |
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Ok---Where do i start looking ?? i pulled all the fuses under hood in fuse box except the square metal ones and nothing changes and even when i pull the clock fuse it don't even change---Help Please
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#11
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Do you have any wires coming off the positive terminal aside from the factory mercedes ones that are on the connector?
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#12
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No--Main positive wire and one thinner wire---car is stock---today i pulled the clock fuse and meter read .08 with the fuse in it bounces from .09 to .10 like everytime the second hand moves it goes to .10
Last edited by jlw15; 03-19-2012 at 05:48 PM. |
#13
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80mA isn't that bad. That can be a combination of things like the radio,alarm,immob,telephone,clock,etc all drawing a little current adding up to 80mA. Don't worry about it unless you experience trouble. If the battery drains in less than a week something is wrong or the battery is defective. To give you an idea : a standard LED draws about 10mA and can run about 6500hrs(270 days) when connected to the average car battrery(657).
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#14
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I know when the battery was replaced a couple of years ago i wasn't there and the mechanic did not put the proper battery replacement in---i have had this battery load tested and it shows fine---i only drive this car once every couple of weeks and in that amount of time the battery won't start the car. ----if i disconnect the battery it stays charged with no problem.
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#15
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You might want to consider trying this. Just below the battery on the firewall closest to front of the car there is a distribution block. If you put your meter in between the positive terminal and each individual wire/wireset (removing them one-by-one) you might find that your drain is coming from the alternator or fuse box or starter. I know when my 190E's alternator went it produced a large draw on the battery.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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