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DIY: Radio switch

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Old Sep 26, 2004
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DIY: Radio switch

ok not sure where this was supposed to go.. but here goes..

I was sitting in my car thinking... wouldnt it be cool to be able to listen to the radio without having my key in the ignition
reason for this switch was so i can have the radio on, fill the tank, and run in and pay without having to worry about someone stealing my car, friends moving it, and whatnot

so after some deliberating, i decided to do it

things you need...
philips screwdriver
switch (on-off)
wire, any gauge, doesnt matter what color..
connectors to attach the wires to teh switch

basically remove the shroud from the steering column figure out where the wire harness is.. it shouldnt be too hard, its big beefy wires

now you know where everything is... placement of the switch is up to you
disconnect the ground wire from the battery!!! you dont wanna blow fuses or zap yourself
tap into the white wire, run it to the switch

tap into the white with red stripe, and run it to the switch, if you have a lighted switch, run the ground...

thats it... you can now turn on the radio without having the key in the ignition, since you tapped the wires, you can still use the key acc position too so no functionality has been hurt

happy moddin
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Old Sep 26, 2004
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picture of the switch i used...


the other switch is waiting for some more accesories
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Old Sep 26, 2004
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So if the car is running, does it matter what position the switch is in or will the radio work regardless?
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Old Sep 26, 2004
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Originally Posted by IronFist
So if the car is running, does it matter what position the switch is in or will the radio work regardless?
if the car is running, it doesnt matter if the switch is on or not the radio will be on if the car is on like normal
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Old Sep 26, 2004
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good diy.
nice and simple.
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Old Sep 26, 2004
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very simle and nice....might have to give it a try
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Old Sep 26, 2004
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I woulda hidden the switch elsewhere, but neat mod. Next project is use a cluster of relays to make it so the radio stays on after you take the key out, but shuts off as soon as you open the door
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Old Sep 27, 2004
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They have that stock in Dodge Caravans... kinda interesting but neat I guess

Easier way to do this mod is to splice switched power into the constant power wire
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Old Sep 27, 2004
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umm the white wire is constant power... and the white/red wire is the switched power.. so you are just "jumping" the power
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Old Sep 27, 2004
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I mean on the deck itself
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Old Sep 27, 2004
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maybe.. but then you wouldnt have use of your 12v outlet or cig lighter if your car is equiped as such
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Old Sep 27, 2004
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if you didnt switch it, it would be on all the time and possibly drain the battery. Also, I know Dodge cars do that...most domestics do that.
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Old Sep 27, 2004
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exactly why theres a switch
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Old Sep 27, 2004
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Me = knows nothing about electronics.
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Old Sep 27, 2004
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Does that switch light up or anything to let oyu know its on?
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Old Sep 27, 2004
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not my particular switches.. but you can get switches that light up

look ma! no key!!!
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Old Sep 27, 2004
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Sick Nasty
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Old Sep 27, 2004
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ncie diy. i got the same HU as you
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Old Sep 27, 2004
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Originally Posted by abmerop18
ncie diy. i got the same HU as you
actually i got the premier deh-p650

which is the same thing.. except you got the newer version with like an extra display mode.. but the faceplates are interchangeable.. hehe
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Old Sep 28, 2004
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if I were you guys, id tap into the constant wire right behind the radio, rather than the steering column. youll save yourselves boatloads of work. its the same color, too.....
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Old Sep 28, 2004
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oh well, whats done is done altho this way you got your 12v socket or cig lighter availible too
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Old Sep 28, 2004
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doesnt it just back feed and turn on all your accessories anwayys?
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Old Sep 28, 2004
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i suppose it would, but the wire under the ignition harness is really beefy
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Old Sep 28, 2004
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wow this is gonna be a mess....taking wire harnesses out of the steering column...*risky*

for what? for 5 minutes or less at the gas station
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Old Sep 28, 2004
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use a credit card....then u dont have to run in a pay
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Old Sep 28, 2004
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but the wire in teh radio harness is cuter? I dont get it, why is bigger neccesary here?

unless you plan to run a coffee maker off your accessory socket while stopped...... I thought this was just for your radio? maybe cell phone charging too?
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Old Sep 28, 2004
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would this work for an after market HU?

those of us with more powerful systems might worry about leaving it running to long and killing the battery :P
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Old Sep 28, 2004
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this will work for any accessory.

those of us with more powerful systems might consider responsible listening with the car off or protection agasint dead batteries if this is something we are serious about doing.
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Old Sep 28, 2004
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might be able to get away with using a deep cycle battery...
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Old Sep 28, 2004
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definitely able to get away with a deep cycle battery. my car could run no subbass on a die hard deep cycle battery for 7 days straight (straight being only when im actually driving) before the battery died.

never tried to kill the battery with subbass in a single run, but the goal is to last through a drive in movie at high volume including subbass.

deep dycle is defintiely the way to go for any extended listening with the car off.

but you can just upgrade the under hood battery to a red top and the car should be good for at least an hour with the vehicle off with 1200 rms of subbass at medium volumes.
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