Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 09-16-2008, 09:34 AM
Registered User
Join Date: May 2008
Location: Aurora IL
Posts: 8
New Stereo for 84 MB300D.Easy job... NOT !

1. ) The original Elektronic AM-FM-Cassette Player has bitten the dust.
...actually- looks like it got bit by black engine oil, from a leak behind the climate control panel.
Any ideas what caused that ?
I was going to slip a thin sheet of aluminum between, to protect the new stereo, but....where IS that oil coming from ?
2. ) How to connect the Power Antenna. Original radio power harness has 4-wire connector, and separate ground wire.

Here's how far I've gotten:
MB red = +12v-----------------to new stereo yellow
MB grayish=--------------------???
MB black=switched +12v-------to new stereo red
MB brown ----------------------???

It plays CD's, just fine, thank you. Of course it won't do 4-way speaker control from the new stereo, unless I want to take apart the panel with the front-rear balance control,so I'll probably leave it.
Anyway,how does the power antenna connect ???
I turned everything on, and tried the new stereo BLUE wire to the MB gray, then to the MB brown. Nothing.
Maybe some combination of both ? Or does it need a special adaptor ? Thanks for any ideas here !

Reply With Quote
Old 09-16-2008, 11:58 AM
Registered User
Join Date: Aug 2008
Location: Las Vegas, Nevada
Posts: 61
Dont know if this helps but for my 87 300d i went to and printed the picture of there adapter harness and matched from there.. Everything works including power antenna...i did not want to wait for harness to ship..i did still leave still leave the console mounted speaker fader connected for ease of installation..
Reply With Quote
Old 09-16-2008, 12:47 PM
mobetta's Avatar
Join Date: Mar 2006
Location: minnesota,hey.
Posts: 1,841
brown is ground in europe.

you can get into the wiring between the deck and fader to access wiring to all 4 speakers. and thus eliminate the fader controls.

the power antenna is also controlled by the switch above the deck. did it work before?? I think it is the gray one.

do a search in the audio section, it has all been hashed out before.
1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.
Reply With Quote
Old 09-16-2008, 12:55 PM
DubMutant's Avatar
salt and sand go hand in
Join Date: Aug 2006
Location: Southern New England
Posts: 243
use search, but also...

I have to say this - there are several write ups on how to bypass the center console fader switch. Its really easy. It took me 5 minutes.

The oil is coming from oil in the vac system that is draining oil- a P.O. may have let a vac issue go to long and some oil was sucked into the system is now draining out of the climate control switches. You want to check the vac system for leaks and the climate control behind the panel for a leaky vac hoes. You can disconnect it and drain it but 1st make sure the vac system doesn't leak.
1984 300D
Reply With Quote
Old 09-16-2008, 12:58 PM
Registered User
Join Date: Sep 2008
Posts: 19
On the car's original radio, I believe the power wires (which are wired into the plastic insert that plugs into the original radio) are as follows:

Brown = ground
Black = switched 12v (comes on with the key)
Gray = illumination 12v (supposed to switch on when you put on your lights - I ignore this one)
Red = constant 12v (to keep your stereo presets etc.)

The wire for the power antenna, which you should connect to your new radio's blue lead apparently, is separate from these four. If I remember correctly, it is black, and unless it has been modified from the original equipment, it has one of those spade connector terminations.

Good luck,


1983 300d (133k)
1983 300sd (118k)

1983 300d (133k)
1983 300sd (118k)
Reply With Quote
Old 09-16-2008, 02:48 PM
rrgrassi's Avatar
mmmmmm Diesel...
Join Date: Jun 2006
Location: Royse City Tx
Posts: 4,872
Mine had oil in it as well. This was caused by a bad engine shut off valve. I used Gumout carb cleaner sprayed on a rag and wiped all the wires and vacuum lines off.

Also w/the new radio I have, the power antenna only goes up or down. The switch does make the antenna go down when in the off position, for playing CD's. In the middle position, the head unit controlls the antenna. The up or max position for the antenna does not function.


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

03 VW Golf TDI 5 speed 372K Miles

RIP--Lost in fire...82 300D 322K was My Daily Driver-On the search for a w126 now...

90 Dodge D250 5.9 Cummins/5 speed. 350K
Reply With Quote


Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 06:24 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page