Running RCA's and speaker wires to/from trunk...
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Cadillac Audio, Video and Security Systems Discussion, Running RCA's and speaker wires to/from trunk... in Item Specific Cadillac Discussion; Knowing you're supposed to avoid running signal cables alongside other sources of voltage to avoid picking up interference (even with ...
  1. #1
    Hairball's Avatar
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    Question Running RCA's and speaker wires to/from trunk...

    Knowing you're supposed to avoid running signal cables alongside other sources of voltage to avoid picking up interference (even with the best shielded cables), I've always gone out of my way to avoid running power & signal cables/wires together, and also to avoid running RCA cables and speaker wires alongside factory wiring.

    However, since I realize Cadillac has so many billions of wires and hundreds of wire looms and harnesses and a sensor for just about everything except telling you where to find cute single gals, I'm worried now. After seeing how many boxes and computers and motors and other wiring is in the trunk, I'm worried about how/where to run my single 6-channel Monster Cable RCA cable back to my amps in the trunk, plus how/where to run my front speaker wires back up from the amp to the front doors without running them along factory wiring! (I'm not concerned about the rear deck speakers or the subs because the wires will remain in the trunk.)

    I haven't got started on the job just yet, but I'm already worrying. Has anyone else ever had any issues with interference from factory wiring when running RCA cables and speaker wires under the door kick panels? If I have to, I'll run my wires and cables along the TOP of the car just to avoid all the factory wiring.

    I appreciate any advice or opinions. I might be worrying for nothing, but one can never been too careful when it comes to sound quality!

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    Submariner409's Avatar
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    Re: Running RCA's and speaker wires to/from trunk...

    You're fooling with DC in the car's wiring, not AC. Any good shielded signal cable will work just fine and you can run it right along with the main harness - remember, these cars use a LOT of serial data transmission over both 12V wiring and dedicated bus without problems. No, you don't want to run signal cables near DC motors with brushes even though they all have shunt caps nowadays.

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    You're probably right...

    ...in theory. Thanks! I'll keep this in mind.

    But I've had this driven into my head over and over for many years...

    The MECP Study Guide advises:

    "Always run power and signal leads away from each other. The general rule of thumb is to run the battery power, remote turn-on lead, and ground from head unit, equalizer, or other front-end component down the same side of the car that the battery is on. This way you'll avoid having to cross the battery lead over other vehicle wiring, which can lead to coupled or radiated noise. All wiring should be run away from the car's factory wiring due to the fact that these high-current wires can induce noise into the system."

    Of course Crutchfield's guide "The Installation Specialist" they sent me 15 years ago states:

    "Run your power supply leads from your amps down the same side as your battery is located. Run your signal cables down the center of your car between the seats and under the carpet. Finally, run your speaker cable down the opposite side of the car as the power supply leads."

    Well, I would never take my entire front seat out just to run an RCA cable! But I do want to avoid running it along main vehicle wiring harnesses. In today's world, MECP & IASCA can be pretty picky about your routing. I'm not saying I'll be entering any IASCA competitions, but I could since I'm a member and want to be ready just in case. My 3 amps are going to put out just over 1,500 watts RMS, so I certainly don't need to amplify any electric signals.

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    Re: Running RCA's and speaker wires to/from trunk...

    i agree with this
    "Always run power and signal leads away from each other. The general rule of thumb is to run the battery power, remote turn-on lead, and ground from head unit, equalizer, or other front-end component down the same side of the car that the battery is on. This way you'll avoid having to cross the battery lead over other vehicle wiring, which can lead to coupled or radiated noise. All wiring should be run away from the car's factory wiring due to the fact that these high-current wires can induce noise into the system."

    but to make it simple your power wire goes on the same side your battery is same with the ground when you ground it in your trunk. rca signal on the opposite sides i usually put them under the doors plastic molding . its some wires there but a lot of space to play with

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    brk
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    Re: Running RCA's and speaker wires to/from trunk...

    Reality rarely matches the ideal scenario.

    When possible, yeah it's great to separate all the various power and signal/data cables as much as possible. The reality is that you can hardly ever achieve this ideal state unless you tear the whole car apart.

    The A/V world, and especially car A/V, is filled with lots of voodoo, poor understanding of components, and old wives tales. Unless you have an insanely noisy alternator, running your cables alongside your 12VDC wires is not going to cause any noise/interference. Your speaker wires are already amplified and in comparison to the signals that would be theoretically induced from running next to a power or car data-bus cable the signal:noise ratio is such that you're not going to get noise coupled into the speaker wires in any normal scenario.

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    Re: Running RCA's and speaker wires to/from trunk...

    I try to solve all that in advance by just not taking a chance. If at all possible, I never ever run my speaker wires next to power cables. It's highly frowned up in the 12-volt world. It's much easier to just avoid the factory wiring to start with whenever possible.

    The thing that worries me is that a Cadillac has more wires than Home Depot, and more sensors than the space shuttle! All these factory wires and sensors and computers and switches and stuff seems likely to induce noise. There are more ways to pick up noise than just an alternator. And amplifiers tend to amplify noise not normally heard through factory head units and speakers.

    I just haven't got started on my project yet, so I'm not sure what I'm up against in a Seville. I've been installing car stereos (and alarms) for about 35 years and rarely had noise issues since the 70's when equipment wasn't as resistant to noise as it is today. Most cars only have one major wire loom running along the drivers side to things like brake lights, tail lights, etc so you simply run the speaker wires and RCA's down the passenger side. But I've never done a Cadillac with all its computers and wires to deal with and avoid, so I'm not sure if the passenger side has as many factory wires as the drivers side.

    My original question was not IF I should worry about picking up noise, but HOW I should run my wires and cables in a 93 Cadillac with all its factory wires.

    Thanks for all the input.

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    Re: Running RCA's and speaker wires to/from trunk...

    in my 93 devil i separated all the added wires as much as possible but once they get to the trunk its all about placement and planning. when i do car audio i don't use none of the factory wiring unless the HU (headunit) POWER GROUND N SUCH as for the speaker wires i rewire the whole system with upgraded insulated wires. . the answer to your question about the dash board the drivers side is the hard side because of the instrument cluster and steering wheel but the passengers is easy once you take out the glove box lower paneling under the dash oar and the top. just take your time zip tie as you go leave a lil slack between the ties . most of the modules are by the glove box . i have done three cadillac in my time 86 sdv 91 sdv and a 93 sdv. a service manual well tell you what is what . the way caddys are built they are closely built so someone with skinny wrist and hands can be a use . post any questions

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    Re: Running RCA's and speaker wires to/from trunk...

    Quote Originally Posted by still_walkin View Post
    in my 93 devil i separated all the added wires as much as possible but once they get to the trunk its all about placement and planning. when i do car audio i don't use none of the factory wiring unless the HU (headunit) POWER GROUND N SUCH as for the speaker wires i rewire the whole system with upgraded insulated wires. . the answer to your question about the dash board the drivers side is the hard side because of the instrument cluster and steering wheel but the passengers is easy once you take out the glove box lower paneling under the dash oar and the top. just take your time zip tie as you go leave a lil slack between the ties . most of the modules are by the glove box . i have done three cadillac in my time 86 sdv 91 sdv and a 93 sdv. a service manual well tell you what is what . the way caddys are built they are closely built so someone with skinny wrist and hands can be a use . post any questions
    Hey, thanks man! Very informative! I appreciate that. Yeah, I figured a bunch of modules and stuff are somewhere, and yep, the drivers side is always a pain. I'm seriously thinking about running my RCA's and speaker wires down the center of the car. I'm running very high quality 10g speaker wires, and my RCA is a Monster Cable 6-channel that costs over $100 online, so it's very high quality stuff. I just don't want to take any chances or do anything twice.

    Thanks again for the response.

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    Re: Running RCA's and speaker wires to/from trunk...

    100 buck for a 6 channel rcas ouch . can you say ebay. i use all stinger wires great stuff . on the 10 gauge unless you using some aftermarket speakers and running year speakers to amps you wont need 10 gauge its overkill. i ran 12 gauge to my speakers but they went to amps . so i have all my speakers on seperate amps (front rear sub door ). as for running down the center means you have to take the carpet and possible the seats out unless you go along the center consule. but 10 gauge gonna be a pain. if you look in your trunk behind the grey lining there shoal be two black vents by the back seat you can run your power wire on the right cuz the battery is on that side and your speaker/rcas on that side. i have a pic posted on my car domain under my user profile showing that. i ran all my wires under the plastic jams under the doors. take a screwdriver and that black piece should snap out and you will see two screws . take them out and pull the lower door jam and fish the wires . tape or zip ties i rather use tape cause zips get stuck under the carpet post questions

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    Re: Running RCA's and speaker wires to/from trunk...

    Quote Originally Posted by still_walkin View Post
    100 buck for a 6 channel rca's ouch
    I know. I checked several online electronics sources and they're NOT cheap and are almost always out of stock, so they can jack the prices up. Last year I only paid $52 for the same RCA but it was only 16 feet long. Yep, these are overpriced as are all RCA cables due to the huge markup!

    Like the last few installs I've done in my own cars, I'm trying to stay with one brand as often as possible for cables and wires, but it's not set in stone. These are actually cheaper at Sonic than most places!

    http://www.sonicelectronix.com/item_...306-6C-6M.html

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    Re: Running RCA's and speaker wires to/from trunk...

    well here some of the people i use. if they don't have what i need on there store i usually email what i need and they have it
    HookedOnTronics, woofersetc_outlet, SONIC ELECTRONIX STORE,BAG-BOY HOME AND CAR AUDIO WIRING, HIFI SOUND CONNECTION CAR AUDIO. my favs are all is uppercase.

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    Cool. Thanks for the tip...

    The only one I've heard of in your list is Sonic, who I bought 90% of my last system from and who I'm buying 95% of my new system from! They love me! Heck, I spent over $5000 at Sonic just last year! Now I'm getting ready to spend over $1500 there.

    I'll check out those other sites you mentioned since I've never heard of them.

    Thanks again!

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    Re: Running RCA's and speaker wires to/from trunk...

    They all on ebay

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    Re: Running RCA's and speaker wires to/from trunk...

    I am about to embark on setting up the bypass harness 70-1856 to the front and connect to my alpine stereo. Also, I would like to run 4 RCA cables back to the trunk from the dash for an amplifier that will hook up to some additional tweeters and base unit that I will have in the trunk. What is the best way to run the harness wires back to the dash and the RCAs from the dash back into the trunk. Any help would be greatly appreciated.

    T

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    Re: Running RCA's and speaker wires to/from trunk...

    First off why four RCA's . WhT kind of amp you using . Also best way to run your speaker wires and RCA's is to run on the opposite side the battery is on so when you run your amp power wire it won't be too close to your signal wires .

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