C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Crazy Electrical Draw

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Oct 30, 2020 | 04:38 PM
  #26  
BruzeF's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2019
Posts: 30
Likes: 0
C320 wagon
After seat mod

So after the seat mod we still have an unknown draw. So poking around under the seat i put the voltmeter on the brown wire in the adjacent plug and found it to have 9.88 volts when the key is off and out. Maybe this is the draw? Anyone with an idea? Thanks
Reply
Old Oct 30, 2020 | 05:27 PM
  #27  
decorily's Avatar
MBWorld Fanatic!
10 Year Member
Liked
Loved
 
Joined: Apr 2016
Posts: 1,131
Likes: 194
From: Ireland
GLC 300d 4matic
[QUOTE=BruzeF;8182701We still have a large arc when connecting the battery that shows on an in line ammeter to be about 7 amps. /QUOTE]

Any change on the ammeter since you carried out this change?
Reply
Old Oct 31, 2020 | 12:39 PM
  #28  
Russell Ormerod's Avatar
MBWorld Fanatic!
 
Joined: Jun 2011
Posts: 1,494
Likes: 131
From: Cape town
not a merc
Why are you taking voltage measurements looking for a current draw? Connect amp meter and Start disconnecting units if the drain is very high like over 5 amps. Start at alternator.. split the supply to fuse box to narrow the path down. Easy job! 30min you should know what the cause is
Reply
Old Oct 31, 2020 | 02:11 PM
  #29  
BruzeF's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2019
Posts: 30
Likes: 0
C320 wagon
Alternator

We disconnected the alternator. We have taken all relays and fuses out as i posted earlier. Yesterday i posted that there is a plug adjacent to the one i did the seat mod on that has a brown wire and a brown/blue wire in it. The brown wire on this plug has 9.88 volts on it with the key off and out unless i pull fuse #2 in the rear box.. My inquiry was does anyone know if this could be the draw and why does it have an odd voltage. Thanks
Reply
Old Oct 31, 2020 | 02:22 PM
  #30  
BruzeF's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2019
Posts: 30
Likes: 0
C320 wagon
Ammeter change

[QUOTE=decorily;8191643]
Originally Posted by BruzeF;8182701We still have a large arc when connecting the battery that shows on an in line ammeter to be about 7 amps. /QUOTE

Any change on the ammeter since you carried out this change?
We now have a .2 amp draw on fuse # 64 in the under hood fuse box and a .3 amp draw on fuse #40 in the passenger compartment fuse box. 64 shows to be for audio control and 40 shows to be for multifunction control in a taxi.
Reply
Old Nov 1, 2020 | 01:35 AM
  #31  
Russell Ormerod's Avatar
MBWorld Fanatic!
 
Joined: Jun 2011
Posts: 1,494
Likes: 131
From: Cape town
not a merc
Thsts 0.5 amp. What is the draw when connected to the battery?
Reply
Old Nov 1, 2020 | 10:46 AM
  #32  
BruzeF's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2019
Posts: 30
Likes: 0
C320 wagon
.5 amps

Originally Posted by Russell Ormerod
Thsts 0.5 amp. What is the draw when connected to the battery?
After 15 seconds when the low humming noise stops in the passenger compartment there is a .5 amp draw. Then after a few more seconds it is a .3 amp draw. Being unfamiliar with the low humming noise (barely audible) i can only guess it is a hard drive compiling data before shutting down.
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 05:21 PM.

story-0
8 Oddball Mercedes Ideas That Actually Made it to Production

Slideshow: Mercedes has never been afraid to experiment, and some of its strangest ideas turned out to be surprisingly successful.

By Verdad Gallardo | 2026-06-10 17:43:40


VIEW MORE
story-1
Dubai Tuner Gives the Mercedes G-Class An Entirely New Look

Sideshow: A Middle Eastern tuner has transformed the Mercedes-AMG G 63 into an open-top special, replacing nearly every exterior panel in the process.

By Verdad Gallardo | 2026-06-10 15:29:50


VIEW MORE
story-2
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish

Slideshow: Six gift ideas your AMG loving dad or grad will cherish.

By | 2026-06-03 17:26:18


VIEW MORE
story-3
7 Craziest Things AMG Gas Ever Built

Slideshow: Sometimes AMG builds fast sedans. Other times, it builds twin-turbo V12 land missiles and six-wheeled off-road monsters.

By Verdad Gallardo | 2026-05-26 17:59:58


VIEW MORE
story-4
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

Slideshow: Mercedes-AMG's new electric GT 4-Door Coupe trades combustion for software, synthetic noise, and more than 1,100 horsepower.

By Verdad Gallardo | 2026-05-20 20:08:15


VIEW MORE
story-5
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-6
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-7
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-8
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-9
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE