Thanks for that - I'm leaning that way too. I got a suggestion to test
the alt easily - was told "Hold a piece of steel ( like a screw driver )
against the alternator pulley or back of the alternator, if it sticks
the field is staying on or there is a shorted diode for the stator.
Actual shorted not what some call any electrical fault."
Don't know if this will work but it's worth a try. And I'm pretty sure
a shorted alt will cause the alt to magnetize.
Make sense? I'm charging the battery so I can try it tomorrow... been
busy with lots of other things going on.
Larry
...
On 12/27/2019 8:39 PM, Curley McLain via Mercedes wrote:
Major juice draw with ign off is alternator, in my experience. No
easy fix, change alternator.
Larry Turner via Mercedes <mailto:mercedes@okiebenz.com>
December 27, 2019 at 6:55 AM
yeah, there are 3 fuse boxes I know of - trunk, engine compart, near
drivers seat. There are also a number of what I think are relays
near the battery/spare tire in the trunk. I have a MB workshop
manual and as usual, it takes a while to learn how to navigate it.
I'm still learning.
re Aux Battery - yep, replaced it with no change. The dash display
shows a battery symbol and something saying it needs to be
serviced. I need to buy a proper battery for the trunk and retest
everything. At one point I had a fully charged battery and all the
comfort extras seemed to wake up and the tranny and everything else
worked as they should - things like cruise control, and some other
things I don't recall at the moment. I haven't been able to spend
time chasing problems properly recently but hope to get a correct
primary battery and check things more completely.
It's a beautiful car and the engine runs great even with the CEL on.
Had that checked and there is a common problem with the balance
shaft. Spoke with two techs at MB and both said the same thing -
spending $3-$5K on a engine rebuild (MB prices). They have had
customers who did have the engine repaired, reinstalled and couldn't
tell a difference in the way the engine behaved. It seems the only
thing different was the CEL was off. SO I'm not worried about the
engine. The AT is different. It has 2 driving modes: Sport and
Comfort which are accessed using a button on the console. Much of
the time recently, it was impossible to change modes. Also, to put
it in Park, you must turn the ign off to remove the key.
Cudo's to MB for extending the warranty +20 or 25 years (!) for the
fuel system. When we had fuel smell they replaced everything around
the fuel tank - pumps, filters, etc.
Let's see, what else? When the AT goes bonkers, it will not shift
out of 2nd making the engine run much higher than normal rpm's. Not
a major flaw IMO but my wife is uncomfortable with such things ;-)
Since she's the primary driver I need to cater to her needs. Anyway,
Battery 1st, then we'll see. But I fear the Alternator may be the
reason for the short causing the battery to drain quickly. But I need
to jack the car up so I can crawl under and disconnect a wire then
test for the power drain before I'll know.
Thx for the comments --
LarryT
06 E350 (from a perfect MB - exc for that little rust problem ;-) to
one with major problems) Duh...
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