1987 Mustang Radio Install. Need some serious electrical help! - Ford Mustang Forum
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post #1 of 20 (permalink) Old 02-01-2007 Thread Starter
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Exclamation 1987 Mustang Radio Install. Need some serious electrical help!

Alright i need someone to help me, someone who knows what they are talking about when it comes to wiring up a radio.. Its going in a 1987 ford mustang gt(or any fox stang that came with a factory Graphic EQ)....Here is the deal...I have an aftermarket radio which im trying to wire up into my car...My car has an EQ which i want to do away with or bypass. I bought the wiring harness for my car which has the black and grey connector, that was easy to wire up to me radio...Now here is the thing the EQ harness has all the speaker wires im assuming and some additonal wires which looks like a ground wire and some other wires....The grey connector is successfully connected from the car to the radio(which as the ground and all that good stuff)...Now i disconnected the black harness that was connected to the radio which has all your 8 speaker wires positive and negative, so obviously im going to have to do away with the black harness...So anyways what i did was took 1 positive wire at a time and tried to find the speakers...so i successfully found them all and had all 4 positive speaker wires connected from the radio to the car and guess what i had sound. also i noticed that a couple other wires are connected that use to be connected to the EQ harness so maybe ive got to many ground wires or somthing becauuse something not right that i have 4 positive wires connected and no negative wires connected and still have sound.....its weird isnt it? none of the negative wires were connected from the radio to the car so it seems like the radio successfully wired up....well this cant be right, right? because you have to have the negative wires connected im guessing?.....but when i put the radio on mute i hear a static or distortion sound, so abviously its not wired up right because it shouldnt make that noise....so what i have done now is i have disconnected all of the 4 positive wires and here is where i am....i need someone to try and help me wire my speaker wires from the radio to the car.....the only problem is i dont know what is what when it comes to the wires in the car.....the wires from the radio is no big deal because it tells you what they are in the instruction manual.......anways any help is MUCH apppreciated! please someone out there must be able to help! thanks....
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post #2 of 20 (permalink) Old 02-01-2007
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You want to tap into the speaker wires where they come out of the EQ. Do your adapter plugs match up to the connectors for the EQ?
If worse comes to worse, you could run your own speaker wires.

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post #3 of 20 (permalink) Old 02-02-2007
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If you have an EQ, doesn't that mean there is an Amplifier somewhere in that system, or is the EQ its own Amplifier?


Well if it has an amplifier, you need to get on the other side of the Amp to get thte speaker wires, if not then you ust need on the other side of the EQ and bypass any of the wires between the radio and EQ.

You are on the right track to be hooking up your speakers, but you do need a NEgative to each positive and it needs to run back to the radio to prevent intereference. Those speakers are aboviously still grounding to something, probably through the EQ, and thats why you still have sound.

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post #4 of 20 (permalink) Old 02-02-2007
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Here is the wiring color codes for the speakers, according to my Haynes book. (Not sure how accurate this is, but its probably pretty close). The odd thing is that some colors are reused. Now, I don't know if Ford did some crazy **** with the premium sound, wiring some speakers in series and some in parallel or if they just reused colors. The front speakers on each side (door and dash) do need to be tied together (in parallel) off the new radio. All of these wires are located in a single plug coming out of the "factory premium sound" amplifier and need to be pulled from that point to bypass the eq and the factory amp. I don't know the location of the factory amp, however, as I have never actually swapped a radio on a car that had it. Maybe someone else can chime in here with an exact location, although I would imagine it is probably tucked up in the dash somewhere. Tracing the wires coming out of the eq will lead you back to it as all of those wires are inputs to the factory amplifier, for the most part.

Orange w/ light green stripe - left front positives (2 exit the same lead in the harness)
Light blue w/ white stripe - left front negative (2 exit the same lead in the harness)

White w/ light green stripe - right front positive (2 exit the same lead in the harness)
Dark green w/ orange stripe - right front negative (2 exit the same lead in the harness)

Pink w/ light green stripe - left rear positive
Pink w/ light blue stripe - left rear negative

Pink w/ light blue stripe - right rear positive
Dark green w/ orange stripe - right rear negative

Hope this helps....

92GTconvertibleSS331,DSS stud girdle&windage tray,Camshaft Innovations cam,AFR185's,1.6 RR's,Performer RPM II intake,75MM TB,90MM MAF,Mac CAI,MSD dizzy,MSD coil,MSD 6A,Mallory hi-flow water & thermo,Accel 30lbs,Mallory rails,BBK 255,Griffin alum radi,Black Magic fan,10" stall,built AOD (Lentech valvebody, Red Line clutches, 2.84 planetary, deep pan),alum driveshaft,4.10's, B&M Hammer shifter,Mac unequal shorties,Mac Hi-flo h-pipe,Mac 3" Pro-dumps,Gran. subframes,control arms,NOS 100 shot
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post #5 of 20 (permalink) Old 02-02-2007 Thread Starter
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Quote:
Originally Posted by GTconvertible View Post
Here is the wiring color codes for the speakers, according to my Haynes book. (Not sure how accurate this is, but its probably pretty close). The odd thing is that some colors are reused. Now, I don't know if Ford did some crazy **** with the premium sound, wiring some speakers in series and some in parallel or if they just reused colors. The front speakers on each side (door and dash) do need to be tied together (in parallel) off the new radio. All of these wires are located in a single plug coming out of the "factory premium sound" amplifier and need to be pulled from that point to bypass the eq and the factory amp. I don't know the location of the factory amp, however, as I have never actually swapped a radio on a car that had it. Maybe someone else can chime in here with an exact location, although I would imagine it is probably tucked up in the dash somewhere. Tracing the wires coming out of the eq will lead you back to it as all of those wires are inputs to the factory amplifier, for the most part.

Orange w/ light green stripe - left front positives (2 exit the same lead in the harness)
Light blue w/ white stripe - left front negative (2 exit the same lead in the harness)

White w/ light green stripe - right front positive (2 exit the same lead in the harness)
Dark green w/ orange stripe - right front negative (2 exit the same lead in the harness)

Pink w/ light green stripe - left rear positive
Pink w/ light blue stripe - left rear negative

Pink w/ light blue stripe - right rear positive
Dark green w/ orange stripe - right rear negative

Hope this helps....


yeah im gonna try and do that but right now im at work...so when i get home im gonna try it out....but the EQ harness has been cut off so im gonna try to see if those colors match up so i can find the 8 speaker wires positive and negative....thanks for all the help i really do appriciated it...i will let you know how it turns out

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post #6 of 20 (permalink) Old 02-02-2007
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You want to pull your wires from the connector on the amp, so do your best to locate that. That way, you will be bypassing all of the factory stuff and connecting your new radio directly to the speakers. By the way, the amp should have 3 connectors on it....one leads to the factory radio, one leads to the eq and the last is the connection to all the speakers. That is the one you want, which *should* match up to the colors I gave you.

92GTconvertibleSS331,DSS stud girdle&windage tray,Camshaft Innovations cam,AFR185's,1.6 RR's,Performer RPM II intake,75MM TB,90MM MAF,Mac CAI,MSD dizzy,MSD coil,MSD 6A,Mallory hi-flow water & thermo,Accel 30lbs,Mallory rails,BBK 255,Griffin alum radi,Black Magic fan,10" stall,built AOD (Lentech valvebody, Red Line clutches, 2.84 planetary, deep pan),alum driveshaft,4.10's, B&M Hammer shifter,Mac unequal shorties,Mac Hi-flo h-pipe,Mac 3" Pro-dumps,Gran. subframes,control arms,NOS 100 shot
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post #7 of 20 (permalink) Old 02-04-2007 Thread Starter
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no luck

well i have had no luck...i have found 4 wires (coming from the car) and found what speaker they go to...and it doesnt matter wether you connect them to a positive or negative speaker wire to the radio it works...and also i dont know if those 4 wires are positive or negative....im about to take it to a professional, because this is aggrivating..lol

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post #8 of 20 (permalink) Old 02-05-2007
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You could run your own wires to each speaker.

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post #9 of 20 (permalink) Old 02-05-2007 Thread Starter
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Quote:
Originally Posted by GTconvertible View Post
You want to pull your wires from the connector on the amp, so do your best to locate that. That way, you will be bypassing all of the factory stuff and connecting your new radio directly to the speakers. By the way, the amp should have 3 connectors on it....one leads to the factory radio, one leads to the eq and the last is the connection to all the speakers. That is the one you want, which *should* match up to the colors I gave you.

im gonna try that this weekend. before i decide to take it to a professional...if i could locate the amp then that should work, cause i pulled the back speakers out and the colors matched to those you gave me...also there are 3 connectors an eq, black, and gray...so i'll give it a try...thanks man.

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I always run my own speaker wires and Power Ground when installing a new head unit. I don't like to chop up the factory stuff.

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post #11 of 20 (permalink) Old 02-05-2007 Thread Starter
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Quote:
Originally Posted by Kyle F View Post
I always run my own speaker wires and Power Ground when installing a new head unit. I don't like to chop up the factory stuff.
thats what i really want to do...but im not to sure about how to go about doing that in the right way..

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post #12 of 20 (permalink) Old 02-05-2007 Thread Starter
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i think i figured it out...i looked further into the dash and i found 2 other harnesses one green and one gray....the gray harness has the 12 speaker wires which match up to the colors gt convertible gave me...so im gonna try and connect the 8 wires to those 12 wires and see what happens...if those are the speaker wires then everything should work out...hopefully i wont have to run another ground wire somewhere....but when i get off of work tonight im gonna try it and see what happens...i will keep you guys updated..

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Good luck. If you do end up running your own speaker wires, just run 'em out of the radio, over to the driver side. Run 'em under the front kick panel, then along under the long plastic strip. From there, run 'em under the rear driver side kick panel, and run the passenger side wire under the back seat, over to the rear pasenger side kick panel, and up to the speaker. I've done this a few times, it's not too hard, it just takes some work, as you have to remove a few interior panels. The bottom of the back seat just pulls up, and requires no tools. The hardest part is getting all of the screws (like for the kicks and the long plastic "threshold") to thread back in.
If I were gonna run new wires to the dash speakers, I'd just feed them into the speaker hole, and find them under the dash, and run 'em to the radio. The door speakers would involve removing the front kicks, and the interior door panel.

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is the distortion engine noise? kind of like a whine that changes sound when you hit the gas. if this is your problem it might be a bad ground.that just happened to me recently
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post #15 of 20 (permalink) Old 02-06-2007 Thread Starter
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okay well i found the amp. disconnected the amp and tried hooking the positive speaker wire from the radio to the car and got nothing...now that i think about it maybe i should have tried hooking up a positive and negative but now its too dark outside....but im wondering even if i did and it didnt work im working what else could be the problem...

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