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  #1  
Old 01-09-2014, 05:22 PM
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'1995 New Stereo Install

Hello, I been combing the forums for some help on installing a new radio unit in my 1995 E320, but still have questions. The original Becker unit I’m replacing has 2 “harness” connections and a “tab” connection at the bottom rear that pops off when I pull out the unit. I purchased a wiring adaptor (Metra 70-1784) and the antenna adaptor (Metra 40-VW12). I have diagrams for the wire connections, but am trying to figure out a few things. #1- What does the original small 5x2 connection do and do I need it for my new stereo? #2- My new unit has 2 pre-out connections which I’m guessing would connect to an amplifier. Do I need a different wiring adaptor (Metra 70-1786) or need to connect to these Pre-outs at all? #3- Do I need to use the ground strap “tab” connection on my new unit? Thanks in advance for any help ya’ll give me!
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Old 01-10-2014, 01:37 PM
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Welcome!

1. IIRC one plug is not used for the new stereo install. The plugs that fit the wiring harness adapter are all you'll need. I believe that extra plug carries stuff like the speed signal input and other miscellany the new stereo doesn't want.

2. Your deck's pre-outs would be used if you were adding aftermarket amplifiers. The stock stereo system wants speaker-level inputs, so the inputs the 70-1784 provides will be correct. Don't use the 70-1786: you'll find that the resultant audio volume is unacceptable unless you have superhuman levels of hearing acuity.

3. No. The tab connector is what alerts the Becker radio that it has been removed from the dash, triggering the radio code. This is unused on your new stereo.

A couple other thoughts:

I believe the 12V constant and switched wires are reversed on the 70-1784. If you find that the stereo won't remember settings, reverse the red and yellow wires between the harness adapter and the new stereo's harness.

Regarding the power antenna: the car has one wire that controls both the amplifier and the power antenna, whereas the 70-1784 incorrectly splits it in two. Take the blue/white wire off the new stereo's harness and connect it to BOTH the blue and blue/white wire on the harness adapter. Your power antenna will extend whenever the stereo is on, regardless of whether the radio is what you're listening to or not, but this is a limitation of the car's wiring.

Out of curiosity, what new headunit did you pick up?

EDIT: corrections

Last edited by TheAlmightySam; 01-10-2014 at 01:56 PM.
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Old 01-10-2014, 05:21 PM
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Thanks a lot for helping me out! I picked up the Alpine CDE- 143BT receiver from Crutchfield. Looks like a nice unit for the price. The only other issue I have is whether everything will fit back in once I connect the adaptor and splice/crimp onto the Alpine harness. Think it would make more sense to splice the Alpine unit directly without using the adaptor? I'm not planning on re-installing the Becker radio.
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Old 01-11-2014, 12:27 AM
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I would still use the harness adapter, just for the sake of not hacking into your factory wiring. I crammed a Kenwood KIV-BT901 with wiring for three sets of pre-outs, two sets of video wiring, USB, and a bunch of other crap in my dash, so there's more room back there than you think. Make sure as you're doing your harness wiring you keep all the wires the same length and zip-tie the splice connector bundle together so you can tuck it under the DIN cage and out of the way.
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Old 01-11-2014, 03:20 PM
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Sounds good. Thanks again.
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