Electrical Drain 2002 E320 - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 07-25-2019, 04:18 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Jan 2018
Vehicle: 2002 E320
Location: Lincoln, California
Posts: 24
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
(Thread Starter)
Question Electrical Drain 2002 E320

Battery drain started at random about a week ago. No problem starting multiple times during the day but when it sits overnight it drains the battery to the point where it will not start.
Battery, starter and alternator checked out well.
Ideas?
Timsawdey is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 07-25-2019, 04:37 AM
BenzWorld Elite
 
Witek_M's Avatar
 
Date registered: Sep 2008
Vehicle: 1972
Location: Dallas, Texas
Posts: 6,449
Mentioned: 16 Post(s)
Quoted: 911 Post(s)
Your thread belongs in W210 forum.

Trunk light, blower speed regulator, PSE pump. Any water inside vehicle? Wet carpet, wet battery area?

Connect amp meter in series with negative battery cable or use accurate clamp on probe to check amount of current draw.
mrboca likes this.

1972 280SEL 4.5
1999 ML320
2000 E320
2003 ML350
Witek_M is offline  
post #3 of 13 (permalink) Old 07-25-2019, 06:22 AM
BenzWorld Elite
 
Michael Pillay's Avatar
 
Date registered: Oct 2003
Vehicle: 500SE AMG, E350 4matic, GL 450
Location: Michigan
Posts: 5,643
Mentioned: 0 Post(s)
Quoted: 134 Post(s)
There are several videos on youtube that walk you through the procedure of finding a parasitic draw.

Mike
Michael Pillay is offline  
Sponsored Links
Advertisement
 
post #4 of 13 (permalink) Old 07-25-2019, 10:42 AM
BenzWorld Veteran
 
Date registered: Nov 2014
Vehicle: 2000 E 320 Wagon + 2002 ML 500 SUV
Location: Pineywoods Region of East Texas
Posts: 718
Mentioned: 1 Post(s)
Quoted: 161 Post(s)
Quote:
Originally Posted by Michael Pillay View Post
There are several videos on youtube that walk you through the procedure of finding a parasitic draw.
Indeed!

YT's legendary crazy Scotty Kilmer showed connecting a simple light bulb circuit tester between neg battery terminal & cable - the parasitic draw will illuminate bulb.

Begin pulling fuses or relays one at a time until light goes dark, that identifies problem circuit.

Simple !

Gone, and fondly remembered:

1975 240D - 4 speed manual, power nothing
1984 190E 2.3 - Cute, reliable & slow
1983 300SD - Great highway tourer, 28mpg

Here & greatly appreciated:

2000 E 320 Wagon -
2002 ML 500 - Finally got one !
2000 E 320 White Wagon is online now  
post #5 of 13 (permalink) Old 07-25-2019, 12:43 PM
Outstanding Contributor
 
Date registered: Jun 2012
Vehicle: 1998 E320 base sedan @ 160kmiles
Location: Boca Raton, FL
Posts: 5,277
Mentioned: 79 Post(s)
Quoted: 1187 Post(s)
Send a message via Skype™ to mrboca
Not so simple.

What Kilmer suggests may be OK for old cars, but the new cars support many circuits per fuse, plus not all circuits are supplied by a fuse (e.g. the blower regulator).

In many cases, the current drain small and is not enough to light a test bulb. Witek's suggestion is a good one. It is always a great idea to find out exactly what the drain current is. It usually leads to possible clues.

There is also voltage drop measurements on each fuse. As each fuse has certain resistance, if certain amount of current flows through the fuse, it will provide a voltage drop in the millivolts range. This is a non-intrusive test, but requires some experience, a decent voltmeter, and knowledge of standard fuse resistances.

BTW: If the car is a 2002 E320 wagon, it belongs to W210, if sedan it is W211.

Last edited by mrboca; 07-25-2019 at 12:46 PM.
mrboca is online now  
post #6 of 13 (permalink) Old 07-28-2019, 12:32 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Jan 2018
Vehicle: 2002 E320
Location: Lincoln, California
Posts: 24
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
(Thread Starter)
Found it!
A 7.5amp fuse under the back seat was drawing 1 amp when everything was off.
Now I need to find a schematic to see what the fuse powers.
Thanks for your help!
Timsawdey is offline  
post #7 of 13 (permalink) Old 07-28-2019, 01:09 PM
Moderator
 
raymond-'s Avatar
 
Date registered: Jan 2004
Vehicle: 99 E320
Location: seattle, wa
Posts: 4,924
Mentioned: 7 Post(s)
Quoted: 214 Post(s)
Lifetime Premium Member
raymond- is offline  
post #8 of 13 (permalink) Old 07-28-2019, 01:28 PM
Outstanding Contributor
 
Date registered: Jun 2012
Vehicle: 1998 E320 base sedan @ 160kmiles
Location: Boca Raton, FL
Posts: 5,277
Mentioned: 79 Post(s)
Quoted: 1187 Post(s)
Send a message via Skype™ to mrboca
Two fuses of 7.5 amp value. One is for the CTEL transmitter (fuse 15), the other is for the steering angle sensor module + alarm siren (battery powered): Fuse 11. Typically when the battery goes bad, the siren module has a tendency to draw current. Or, of course, the alarm condition is ON, but the horn with the battery is is bad.

For the CTEL transmitter, there have been cases of disintegrated wiring insulation causing the current draw.

Last edited by mrboca; 07-28-2019 at 08:10 PM.
mrboca is online now  
post #9 of 13 (permalink) Old 07-28-2019, 06:19 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Jan 2018
Vehicle: 2002 E320
Location: Lincoln, California
Posts: 24
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
(Thread Starter)
The piece of tape indicates the spot where the fuse was.
Attached Thumbnails
Click image for larger version

Name:	E320 Fuse Board.jpg
Views:	10
Size:	173.3 KB
ID:	2531252  
Timsawdey is offline  
post #10 of 13 (permalink) Old 07-28-2019, 08:03 PM
Outstanding Contributor
 
Date registered: Jun 2012
Vehicle: 1998 E320 base sedan @ 160kmiles
Location: Boca Raton, FL
Posts: 5,277
Mentioned: 79 Post(s)
Quoted: 1187 Post(s)
Send a message via Skype™ to mrboca
E-Call (Tele-aid).
mrboca is online now  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W210 E-Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome