Audio Systems/Merc E-class

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Expert: - 3/26/2009


Question
Where would I locate the Acc (the one which starts with ignition) in the merc? Its not on the ISO block and i've looked everywhere? Whats the simplest and easiest way to solve this?


Answer
The accessory line comes off the ignition as you stated.  And it could have a yellow color.  

But, here is the sure way to find it:

Purchase a small vom (volt ohm meter) from walmart or home depot (under $10) and merely find the wiring from the ignition that comes on when the acc position is switched.  Then you know for sure.  

There may be more than one actual wire that comes up 12 volts at acc but anyone of them will turn on the radio or head end unit since very little current is needed because the head has a 12 line directly to the set that provides the big current for the receiver itself.

Hope this helps.C  

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Cleggsan

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Audio Design Engineer; systems, loudspeakers, cd/dvd players, etc. I am knowledgeable in all high end audio equipment and installations. MAKE SURE YOU GIVE A MAKE AND MODEL NUMBER AND CAR IF IT IS AN AUTO QUESTION. Note: I am getting some who ask good questions that take a lot of time to research but then the questioner fails to read the answer. Please don't ask questions unless you are seriously looking for an answer. If you find an answer to your question otherwise then let me know with your reply. Thank you.

Experience

Have been associated with audio design, standards, testing and component systems for over 40 years.

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Life Fellow Member of Audio Engineering Society Life Senior Member of Institute of Electronic and Electrical Engineers

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Review technical manuscripts for IEEE Spectrum Write occasionally for high-end audio publications

Education/Credentials
BSEE/MSCS/MBA

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Past Employee/advisor to several well known audio products manufacturers

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