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  #1  
Old 02-05-2008, 11:18 PM
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Question W123 - Best place to tap in constant 12V for radio clock

Good evening,

I need 12v constant for the the clock in my new aftermarket radio. only a few mA's.

anybody have an elegant way of doing this to the fuse block
(or anywhere else for that matter) ? I looked up there and it doesn't look easy to tap into the fuse that has the other constant 12V stuff on it like the clock.

maybe i'm missing the secret technique of getting to the back of the fuse block...

dd
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  #2  
Old 02-05-2008, 11:24 PM
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Use the supply to the cigarette lighter........much easier than the fusebox.
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  #3  
Old 02-05-2008, 11:33 PM
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I tapped into the wires from the rear dome light switch.
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  #4  
Old 02-05-2008, 11:37 PM
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Quote:
Originally Posted by Brian Carlton View Post
Use the supply to the cigarette lighter........much easier than the fusebox.
Cigarette lighter is switched on a 123.
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Old 02-05-2008, 11:39 PM
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how about tapping into the... clock? it has a constant 12v supply, and it's not very far away from the radio. it's labeled on the back of the instrument cluster, and it's a standard 1/4" spade connector.
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  #6  
Old 02-05-2008, 11:42 PM
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Mine is tapped from the +12 volts from the hazard light. I think it was a Red/black wire, and a P.O from a long time ago kindly left me a splice covered in electrical tape there.
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Old 02-05-2008, 11:44 PM
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The OE radio connection already has constant 12V for a clock. Why can't you use the old connection?
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Old 02-05-2008, 11:45 PM
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Quote:
Originally Posted by Palangi View Post
Cigarette lighter is switched on a 123.


Guess you can't smoke with the engine not running............
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Old 02-05-2008, 11:46 PM
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There has to be a constant 12 line to the original radio. We need somebody with the electrical ts manual to figure out what color it is.
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  #10  
Old 02-05-2008, 11:47 PM
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Quote:
Originally Posted by Brian Carlton View Post


Guess you can't smoke with the engine not running............
Bad for your health...
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  #11  
Old 02-06-2008, 12:44 AM
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Quote:
Originally Posted by Brian Carlton View Post


Guess you can't smoke with the engine not running............
You can't even honk the horn in my 126 without turning it on. However, the radio will work anytime...
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  #12  
Old 02-06-2008, 03:55 AM
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I agree with the above, the stock radio has a constant 12V source. Time to get the test light and figure out which one it is.
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  #13  
Old 02-06-2008, 07:51 AM
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Hmm, Ill test it out to see if there is one and report back...
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  #14  
Old 02-06-2008, 07:54 AM
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On mine, both +ACC and +BATT were both red wires with no markings differentiating them. I ended up running a brand new line from the battery to the radio anyway, though. Throug the wiring harness thing at the firewall (there are about 6 small channels made for this purpose with caps on them, remove cap, run wire through, and I put a dab of silicone sealant on it to seal it up again)
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  #15  
Old 02-06-2008, 10:26 AM
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There's a wire right there...

I just did this on mine and it was fairly easy as all the wires were already there although unconnected to anything. Here's the rundown:

1. Blue wire with spade connection - goes to antenna (power)
2. Grey wire with male plug - goes to antenna
3. Socket that gives 12v keyed - Brown is [-], Black/yellow stripe is [+]
4. Black socket gives constant 12v - Grey/Purple strips is [-], Red is[+]

On your aftermarket radio, they will have many warnings about connecting the right wire to the right (switched or unswitched) sources. I would heed these warnings. I found everything worked exactly as expected with the above connections made. I believe the white, keyed socket is connected to the cigarette lighter (I wouldn't know as mine was disconnected) You don't need to make any kind of new wiring as its all inside. Wiring the speakers is another story...

Hope this helps!

Quote:
Originally Posted by dieseldan44 View Post
I need 12v constant for the the clock in my new aftermarket radio. only a few mA's.
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