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  #1  
Old 11-30-2014, 06:07 PM
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Question 1982 300SD - new radio install

Hi all,

I'm a new owner of an '82 300SD. I love the car and I'm just starting to get to work on it.

One of my main new tasks is installing my new Sony Bluetooth MP3/CD player. I bought it from Crutchfield and I have the adapter set they sell.

My big problem is that I can't find a way through the firewall to bring constant power from my fuse box to my stereo. I can't find any DIY tutorials or videos and even the Crutchfield techs were stumped on this one.

I've tried putting wire through the grommets in the engine, but I can't find where the wire is going. I pulled the carpet back around the gas pedal but couldn't see anything.

Would love any help on this!
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Old 12-01-2014, 10:05 AM
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I have a '83 SD that had a Kenwood cassette deck already installed when i dought her. Thankfully whoever installed it didn't hack the harness. I replaced the Kenwood with a JVC cd player. It was just a mater of replacing wire for wire. The fader was left in the loop and it still works. I still need to redo the speaker wiring as it has an issue now. I don't remember the exact wire color but your '82 SD should already have a constant 12vdc for memory and for your radio clock. This should help out STAR TekInfo 12vdc in the harness.
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1988 420SEL
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  #3  
Old 12-01-2014, 11:55 PM
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Thanks for the speedy reply! I tried that link, but it said the document wasn't found. Any other way to get the info/document?
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Old 12-02-2014, 07:09 PM
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You are most welcome. That link can act odd depending on what browser you're using. I use IE9 but found some things have to opened with Chrome.
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1983 300SD
1988 420SEL
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  #5  
Old 12-02-2014, 07:41 PM
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On my 300D, I used aconstant 12v feed from the glove box light. It is always live. You can check this by opening the glovebox! Radio needs next to no power to retain settings.
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  #6  
Old 12-03-2014, 11:28 AM
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That is a good idea but on my '83 SD the glovebox light is on a switched power with the key.
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Old 12-04-2014, 12:21 PM
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Thanks. I went to the STAR TekInfo website. It appears it's only accessible with PCs. I have a MAC, so when I can get to a PC I will check out the link. Thanks!
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Old 12-04-2014, 12:25 PM
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Thanks, Graham.

My glove box light is on when my car is off so this sounds like a good option for me. I've only ever replaced my factory stereo with another, equally old Mercedes stereo, so jumping to installing a new blue tooth stereo is proving a little more tricky than I thought. Do you mind telling me how you wired your stereo's power wire to the glove box power wire?
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