93 300E - Need help w/ wiring diagram for radio

lukehill · 11-05-2008, 01:02 AM

Hello all,

I just recently purchased my first Mercedes - a 1993 300E. So far I'm loving it, but I've run into one problem: the stereo. This car was one of the models that had the Becker radio w/ the control unit, amp, cd changer, etc. in the trunk. The current system is no longer working and I'm wanting to install an aftermarket stereo. I know it's a big job requiring some pretty extensive wiring, etc. and I'm fine with that, but the one thing I haven't been able to find is a decent wiring diagram for my car (I'd like to tap in to the existing speaker wires, radio power, etc.). I purchased the Mercedes Shop Manual software discs and have them installed and while they have a ton of information on my car, they don't seem to have a wiring diagram & neither does Becker. Does anyone know where I can find a wiring diagram for this car? Is there anywhere online or perhaps even a book that might have it?

Thanks in advance,
Luke

pmally · 11-05-2008, 01:43 PM

here's a quick tutorial i will write for you
If your car has a fade control by the window controls you will want to rewire that for much better performance from there you can determine which wires are for the rear speakers. Your new aftermarket stereo will come with a wiring diagram to help you out its usually on the top of the unit. I have installed so many stereos in so many different types of cars I can guide you through it.

1. Just buy a volt meter and clip off the old wiring harness from the stock Becker. (you can get a cheap volt meter off the internet)

2. Find which wire gives the radio power while the ignition is off it will be the RED WIRE on the new stereo

* you will need to also find the ground (its usually black).

3. Turn the ignition to the ON posision and find the power wire it will be the YELLOW WIRE on the new stereo

from here you have the power taken care of, next you can wire the speakers up. if you have the fader then you will only have 4 wires to take care of they are usually color coded like green with a black line and the other wire will be green showing that they are a pair to power one speaker.

If you have any questions just ask

pmally · 11-05-2008, 01:44 PM

almost forgot you will have a blue wire coming from the new stereo which will control your power antenna ( if yours isn't broken)

lukehill · 11-05-2008, 02:36 PM

Thanks for the info! I do indeed have the console fader control (which I was planning on getting rid of and retro-fitting an aux input in its place). I think I should be good w/ the power, the antenna and the speakers, but I was hoping to tap into the power amp in the trunk to continue to power the door subs. I notice that the amp in the trunk just has one big connector block w/ all of the wires coming out of it - is there any way for me to determine which ones are the audio inputs?

Thanks again,
Luke

spinlps · 11-05-2008, 03:34 PM

Here are the scans of the two factory schematics that I have. If you need full res pics let me know your email address...

RBYCC · 11-05-2008, 03:35 PM

Here is all the Becker info...

http://www.beckerautosound.com/1432-1992-93/index.html

lukehill · 11-05-2008, 05:13 PM

Spinlps - that's exactly what I was looking for. I've sent you a private message with my e-mail address. Thanks everyone for your help!

pmally · 11-05-2008, 06:20 PM

the amp in the trunk would most likely have an accessory wire that would connect to the red wire on the new stereo so that it turns on when then ignition is on

spinlps · 11-05-2008, 10:15 PM

Quote:

Originally Posted by lukehill

Spinlps - that's exactly what I was looking for. I've sent you a private message with my e-mail address. Thanks everyone for your help!

I didn't get your pm, just email me @

spinlps@pacbell.net

11-05-2008, 01:02 AM	#1
lukehill Newbie Join Date: Nov 2008 Posts: 3	93 300E - Need help w/ wiring diagram for radio Hello all, I just recently purchased my first Mercedes - a 1993 300E. So far I'm loving it, but I've run into one problem: the stereo. This car was one of the models that had the Becker radio w/ the control unit, amp, cd changer, etc. in the trunk. The current system is no longer working and I'm wanting to install an aftermarket stereo. I know it's a big job requiring some pretty extensive wiring, etc. and I'm fine with that, but the one thing I haven't been able to find is a decent wiring diagram for my car (I'd like to tap in to the existing speaker wires, radio power, etc.). I purchased the Mercedes Shop Manual software discs and have them installed and while they have a ton of information on my car, they don't seem to have a wiring diagram & neither does Becker. Does anyone know where I can find a wiring diagram for this car? Is there anywhere online or perhaps even a book that might have it? Thanks in advance, Luke

11-05-2008, 01:43 PM	#2
pmally Almost a Member! Join Date: Nov 2008 Location: Northern California Posts: 26	here's a quick tutorial i will write for you If your car has a fade control by the window controls you will want to rewire that for much better performance from there you can determine which wires are for the rear speakers. Your new aftermarket stereo will come with a wiring diagram to help you out its usually on the top of the unit. I have installed so many stereos in so many different types of cars I can guide you through it. 1. Just buy a volt meter and clip off the old wiring harness from the stock Becker. (you can get a cheap volt meter off the internet) 2. Find which wire gives the radio power while the ignition is off it will be the RED WIRE on the new stereo * you will need to also find the ground (its usually black). 3. Turn the ignition to the ON posision and find the power wire it will be the YELLOW WIRE on the new stereo from here you have the power taken care of, next you can wire the speakers up. if you have the fader then you will only have 4 wires to take care of they are usually color coded like green with a black line and the other wire will be green showing that they are a pair to power one speaker. If you have any questions just ask __________________ 1969 230 70k Miles 2nd Owner, 1980 300SD 200k?, 1982 300SD268K, 1986 300E 165k, 1987 Jaguar XJ6 Vanden Plus 115k, 1991 Jaguar XJ6 Soverign 170k, 1971 GMC 1500 (52k Original Miles) 2nd Owner, 2001 GMC Safari 150k, 1996 Dodge Neon 90k to many cars !!!

11-05-2008, 01:44 PM	#3
pmally Almost a Member! Join Date: Nov 2008 Location: Northern California Posts: 26	almost forgot you will have a blue wire coming from the new stereo which will control your power antenna ( if yours isn't broken) __________________ 1969 230 70k Miles 2nd Owner, 1980 300SD 200k?, 1982 300SD268K, 1986 300E 165k, 1987 Jaguar XJ6 Vanden Plus 115k, 1991 Jaguar XJ6 Soverign 170k, 1971 GMC 1500 (52k Original Miles) 2nd Owner, 2001 GMC Safari 150k, 1996 Dodge Neon 90k to many cars !!!

11-05-2008, 03:35 PM	#6
RBYCC MBWorld Fanatic! Join Date: May 2005 Location: REHOBOTH BEACH DE Posts: 1,020	Here is all the Becker info... http://www.beckerautosound.com/1432-1992-93/index.html __________________ TURBOTECHNICS TWIN TURBO M103

11-05-2008, 06:20 PM	#8
pmally Almost a Member! Join Date: Nov 2008 Location: Northern California Posts: 26	the amp in the trunk would most likely have an accessory wire that would connect to the red wire on the new stereo so that it turns on when then ignition is on __________________ 1969 230 70k Miles 2nd Owner, 1980 300SD 200k?, 1982 300SD268K, 1986 300E 165k, 1987 Jaguar XJ6 Vanden Plus 115k, 1991 Jaguar XJ6 Soverign 170k, 1971 GMC 1500 (52k Original Miles) 2nd Owner, 2001 GMC Safari 150k, 1996 Dodge Neon 90k to many cars !!!

11-05-2008, 02:36 PM	#4
lukehill Newbie Join Date: Nov 2008 Posts: 3	Thanks for the info! I do indeed have the console fader control (which I was planning on getting rid of and retro-fitting an aux input in its place). I think I should be good w/ the power, the antenna and the speakers, but I was hoping to tap into the power amp in the trunk to continue to power the door subs. I notice that the amp in the trunk just has one big connector block w/ all of the wires coming out of it - is there any way for me to determine which ones are the audio inputs? Thanks again, Luke

11-05-2008, 05:13 PM	#7
lukehill Newbie Join Date: Nov 2008 Posts: 3	Spinlps - that's exactly what I was looking for. I've sent you a private message with my e-mail address. Thanks everyone for your help!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread: