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Installing Aftermarket Amp To Factory Stereo


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#1 na_rsx

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Posted 30 April 2008 - 03:44 PM

Hi, new guy here, but not new to car audio. I am installing an after market amp on a 2003 Lexus GS300, and I wanted to know whats the best way to route the power wire? Also is there a tutorial guide on how to take the radio out so I can tap into the stock harness. If I get some help, or answers, I will take pics of the install, and post it back here for future use. My only concern is routing the power wire from the battery to the back, and tapping into the headunit to connect the line output converter.

BTW I am installing:

(2) 10" Pioneer Premier D4 subs (wired into 1 ohm)
(1) Hifonics TXi 1008D (1000rms @ 1 ohm)
(1) Kicker 4 Gauge Amp kit w/ RCA's and Speaker wire
(1) Dual 10" ported box, 2.5 cubic feet

Juan

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#2 BD Mobile Electronics

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Posted 30 April 2008 - 08:54 PM

Can you get to the rear speakers in the trunk? If not here is the information for your car.
Why are you not changing your stock radio?
Battery BLUE/YELLOW (+) RADIO HARNESS
Accesory GRAY (+) RADIO HARNESS
Ground WHITE/BLACK (-) RADIO HARNESS
Illumination GREEN/WHITE (+) RADIO HARNESS
Power Antenna RED/BLACK (+) RADIO HARNESS
Amp Turn On BLACK/ORANGE (+) RADIO HARNESS
LF Speaker (+) BLACK
LF Speaker (-) WHITE
RF Speaker (+) PINK
RF Speaker (-) ORANGE
LR Speaker (+) RED
LR Speaker (-) GREEN
RR Speaker (+) LIGHT GREEN
RR Speaker (-) VIOLET
Radio Security YEs

#3 na_rsx

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Posted 01 May 2008 - 09:14 AM

Can you get to the rear speakers in the trunk? If not here is the information for your car.
Why are you not changing your stock radio?
Battery BLUE/YELLOW (+) RADIO HARNESS
Accesory GRAY (+) RADIO HARNESS
Ground WHITE/BLACK (-) RADIO HARNESS
Illumination GREEN/WHITE (+) RADIO HARNESS
Power Antenna RED/BLACK (+) RADIO HARNESS
Amp Turn On BLACK/ORANGE (+) RADIO HARNESS
LF Speaker (+) BLACK
LF Speaker (-) WHITE
RF Speaker (+) PINK
RF Speaker (-) ORANGE
LR Speaker (+) RED
LR Speaker (-) GREEN
RR Speaker (+) LIGHT GREEN
RR Speaker (-) VIOLET
Radio Security YEs


I never thought about the rear speakers, reason i wanted to tap behind the headunit because i heard its not a pure signal, the amp already had its way with it, if that makes sense. My friend wants to keep his stock radio because he does not want to attract attention, usually when people see a face off, they think system, and thats when they break into a car lol.

So yeah, we got all the stuff, i am doing the install on Sunday morning.

It will be a lot easier

#4 na_rsx

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Posted 05 May 2008 - 08:49 AM

Okay i got mostly everything installed, one problem though, i could not find the remote wire. The ones listed in post 2 did not match the harness i was looking at, right now its getting the constant 12v.

#5 coolc7116

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Posted 02 October 2009 - 12:44 PM

I'm trying to install an aftermarket radio in an 03 GS300. Would you happen to have or know how to find a harness to connect it into the factory wiring? I've seen harnesses from Metra, 70-8113 and 71-8113, as well as one from autotoys. But nobody seems to guarantee that it will work.



Can you get to the rear speakers in the trunk? If not here is the information for your car.
Why are you not changing your stock radio?
Battery BLUE/YELLOW (+) RADIO HARNESS
Accesory GRAY (+) RADIO HARNESS
Ground WHITE/BLACK (-) RADIO HARNESS
Illumination GREEN/WHITE (+) RADIO HARNESS
Power Antenna RED/BLACK (+) RADIO HARNESS
Amp Turn On BLACK/ORANGE (+) RADIO HARNESS
LF Speaker (+) BLACK
LF Speaker (-) WHITE
RF Speaker (+) PINK
RF Speaker (-) ORANGE
LR Speaker (+) RED
LR Speaker (-) GREEN
RR Speaker (+) LIGHT GREEN
RR Speaker (-) VIOLET
Radio Security YEs



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