78 300D ignition switch problems - MBWorld.org Forums

General Mercedes Discussion Use this forum to discuss general Mercedes-Benz topics that are not specifically model related.

78 300D ignition switch problems

LinkBack Thread Tools Search this Thread Rate Thread
Old 02-09-2003, 11:24 AM   #1
Thread Starter
Join Date: Oct 2002
Location: Prescott Valley, AZ
Posts: 6
Drives: 1978 300D
Thanks: 0
Thanked 0 Times in 0 Posts
78 300D ignition switch problems

Two questions. I was going to use the search mode to see if this had been discussed, and I don't see where I can access this mode. I'm sure it's right in front of my face, but the screen is new to me and it takes me a while to sort out what's where. I'll take the ribbing for the bonehead syndrome along with the directions.

The technical question relates to the ignition switch on my daughter's 78 300D. It "feels" as though the switch does not work electrically sometimes. It's as if there is a fuel cutoff solenoid that starves the engine for fuel (haven't looked), and the glow plugs (and indiator light) do not always come on until the start mode is engaged, after start position is disengaged. Lately, the solenoid has been sticking, and I can't tell if it's a bad solenoid or a bad key switch due to the other symptoms.

It appears as if the position of the steering wheel has some effect on these symptoms as well. The question is, can the key switch be replaced, and can these functions be hardwired to switches. I see a few wires with single ended plugs on them, and it looks like there is a cam inside the key switch that may perform these auxiliary cutout functions. I suppose it stands to reason, because the engine has to shut down somehow when the key is turned off.

This car will not be a candidate for a restoration, although it's in good shape. Hot wires and a starter only key switch will work just as easily as replacing the steering column. We just want to get the car on the road as quickly as possible.


lowvolt is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
cigarette lighter and hot/cold cupwarmers not working MannyS430 New M-Class (W166) 7 05-12-2017 07:35 PM
clk 430 2003 roll bar and top problems? JackRobinson CLK-Class (W208) 10 10-19-2015 04:34 PM
Not signal in Ignition Coil #1 Jancker E-Class (W210) 1 09-08-2015 06:30 PM
c240 driver door lock woes FLYNAVY C-Class (W203) 1 09-07-2015 11:27 AM
Anybody else have problems with MY16 C300? jakc C Class (W205) 9 09-04-2015 10:50 PM

300d, 78, bad, igniction, ignition, ingnition, issues, key, mercedes, problem, problems, replacement, starter, switch, symptoms

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

Advanced Search
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 03:05 PM.

Copyright 2001-2012 InternetBrands, Inc. / MBWorld.org. All Rights Reserved.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: