12v Switched Source W114 - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 04-26-2015, 11:11 PM Thread Starter
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12v Switched Source W114

I'm going to wire In a retro sound model two radio into my W114. I was wondering if any of you had pictures or guidance as to where I might find a 12v switched source. Electrical diagrams would help as well. Thank you!
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post #2 of 7 (permalink) Old 04-27-2015, 09:38 AM
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What about the one that sources the original radio? Another option is the cigarette lighter source - my 108's would turn off with the key.
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post #3 of 7 (permalink) Old 04-27-2015, 10:07 AM
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What about the one that sources the original radio? Another option is the cigarette lighter source - my 108's would turn off with the key.
hi , the hazard switch has both constant and switched Power..thats real easy..open the Connector and solder in two extra wires.
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post #4 of 7 (permalink) Old 04-27-2015, 12:33 PM
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Depending on what you need power wise and of course your skill level. A small relay could be set up with a power bar or small accessory fuse bar and fired by the radio source just having a source from the battery? Later Benz used a similar accessory power block that was on the drivers floor at the left side. Simply you turn the key on and the relay triggers and the buss bar becomes hot.
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post #5 of 7 (permalink) Old 04-27-2015, 08:55 PM
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What about the one that sources the original radio?
It can be said no better than that! Wire the radio power feed into the fusebox at its factory-designated fuse terminal (fuse/terminal #3 for the W111). W114 should be similar.

Remove then look inside the cover to your fusebox. Hopefully the paper sheet listing the fuses is still located there, otherwise confirm with the Owner's or Shop manual. It will state something like, "radio" or "free for special requirements".

The screw terminal (to attach the power feed to) is located opposite side of the firewall from the fuse.
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post #6 of 7 (permalink) Old 04-27-2015, 10:26 PM Thread Starter
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I was checking connections today based on thread replies. I checked the hazard light suggestion through the pins in the other side of the hazard light button(to check before cutting anything) but only found a constant 12v source. After this I became confused and tried the cigarette lighter and didn't find 12v either. Could this be a bad fuse? I've also noticed the fans don't turn on any more, as well as finding no voltage in the cigarette lighter socket with a DMM.
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post #7 of 7 (permalink) Old 04-29-2015, 11:57 PM
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hi , i have checked my car and i have wired it such, use the original Power Source for the radio which is through the ignition, then take the constant Power from the hazard switch, and in some cases , a switched Source which is coming from the lighting system so as to dim the radio display when Your head lights are on..my radio required 3 Power Sources .1constant 2 switched 3 from lighting system. items 1,3 can be taken from the hazard switch,no need to cut the wires , just pop open the Connector and solder the wires to the back of the pins, you will also need to make a little more Space to allow the wires to come out..Taking Power from the hazard switch is easy as it is beside the radio in the consul..hope this helps..
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