Just to complicate things, some cars like the 06 E350 MB I have been
struggling with, have an auxiliary battery - I removed the primary
battery for 6 weeks or more and the radio stations were remembered.
When doing a parasitic draw test, should I also disconnect the Aux
Battery? I put a test light in series with the neg cable/post and
pulled all fuses 1 by 1 and the light never even flickered.
Thx,
LarryT
06 E350
On 3/29/2020 9:41 PM, Curt Raymond via Mercedes wrote:
I'd say this is normal. The clock, for one, always draws power. As others
have noted the computer(s) will draw some current when first connected. That
draw will decrease as the computer powers up and gets its act together. It
probably sits in some kind of standby mode until activated by turning the key
on.
Your mention that it doesn't kill the battery reinforces my thought that its
normal. It probably will kill the battery eventually but it'd probably be hard
to tell that from the battery just going flat as it would anyway if you left it
alone long enough...
-Curt
On Sunday, March 29, 2020, 9:26:28 PM EDT, Jerry Herrman via Mercedes
<mercedes@okiebenz.com> wrote:
May I thicken the plot? I was so enthusiastic about this new-found
knowledge, I decided to apply it to a second car, a 91 Volvo (also)240,
because whenever I apply the negative cable to the battery post on that car
I also get a small spark. That has never resulted in a dead or weak battery,
although that car sometimes sits unused for periods of time. Sure enough,
the 12 v test light bulb went on. However, it faded out after about one
second. By repeated tests, I learned that after removing the test light, it
takes about 10 or so seconds for it to recover. If I re-connect the test
light right away, the bulb will not light up. Does this provide some clue as
to what the electricity stealing culprit might be?
Minor issue - I did not know that pictures could be attached to these
submissions. Is there a set of instructions to follow to submit a photo?
Jerry Herrman
1982 240D
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