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Old 04-19-2009, 07:53 PM   #1
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Default Install new amp, bypass bose amp, GMOS-09

Hi guys. I just installed a Pioneer AVIC F90BT using the metra GMOS-09 to keep chimes and make the installation easier. The 09 made the installation very easy, however, the volume has been sacrificed adding the aftermarket head unit. I know it is not a problem with the headunit, and I know the 09 has a gain adjustment which I have maxxed out and still cannot get volume above normal listening volume. Which brings me to a place where I intend to solve the problem by replacing the factory bose amp or amps, with an aftermarket amp. My question is this: Is there a premade harness available to unplug the factory amp, and connect the premade harness to the oem harness and have rca inputs and outputs on this harness to hook up an aftermarket amp? If not, what is the best way to go about it. The factory bose amp sound is not gonna work for me with the new head unit. I need more power, and I have new speakers to install through out as well. Any recommendations would be most appreciated. If there is not harness available that will do what I need, please be detailed in your alternative plan. I wish to place the new amp in place of the original bose amp and make all my connections right there. Is there one amp or two? 2000 Pontiac Bonneville SSEI. Thank you! J
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Old 04-20-2009, 12:23 AM   #2
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very complicated process. I have never heard of a harness that would make life that easy but i could be wrong so, the first off, I would say dig a little deeper on the harness you are curious about. I dont show any speaker wire colors in any of my diagrams. One easy way to figure out what the wire colors are is to pop your trunk and look at your plugs at your rear speakers. When looking at your factory amp, they should be the same color. Do you have a multi meter? If you put it on ohms and go by the process of elimination (I know it will be lengthy but it will work) and check two wires at a time until it reads (2 ohms). You will already have the wires for the rear speakers so the only thing left would be for the fronts. Your tweeters may also be ran seperately and may have the same exact color as your front door speakers so, dont be surprised if you find two sets of identical colored wires. Pop the speakers to see which ones make noise with some scrap wires and a 9 volt battery. The harness will have other wires on it as well but they will not be used. If you dont want to do this, you could also just run your own wires but this is a bit tideous as well but honestly, if time was not an issue, that is what I would do.
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Old 04-20-2009, 12:32 AM   #3
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I have the Mitchel and snap-on diagrams for the entire sound system at my shop, but I have not seen them yet. I will view them tomorrow to see if they have any color break down. They should, if not, I will figure it out. Thanks.
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Old 04-20-2009, 02:36 AM   #4
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Let me know if you need any help. i can sent you pics of my radio. I bought a 7inch LCD touch screen DVD player for my dash. (99 SSEI). Its a japans radio(EONON). I installed it myself. so i might be able to help. Let me know.
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Old 04-20-2009, 03:43 AM   #5
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Thanks for the offer. I just went to my shop and printed the Wiring diagram for the whole system. It is easily understood, speaks for itself. Should be no problem. I didn't think about it, but I have 8 speakers including the tweets. I have a set of kenwood door speakers that have seperate tweeters with them. But I will have to get another set for the rear door and I have some rockford 6x9s for the rear deck. It should be a sweet system. I can't handle the sound I am getting now. I will keep anyone interested informed. I will post that wiring diagram if anybody else needs it. It shows the entire premium amplified system. J
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