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  #1  
Old 05-02-2001, 10:14 AM
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Question Factory Stereo Plugs

Does anyone know what the two plugs on the back of my factory stereo go to. One is a large rectangular plug and the other is a smaller square plug. A tech at a local road shop told me the small plug goes to nothing? Please Help!

99 F150 reg cab sh bed
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  #2  
Old 05-02-2001, 07:27 PM
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Small plug is for the radio, the big plug is for the amplifier. My new radio didn't use the amplifier plug. good luck.

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  #3  
Old 05-07-2001, 01:07 AM
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I have been told the same thing by two installation websites, Crutchfield, and a friend at a stereo shop. I don't buy it. I know the bigger plug is the power and speaker outputs because I have that harness from Crutchfield as I am installing a new head unit as we speak.

I think the small plug has something to do with the speedometer or the computer or else how would it know when I slow down? I do not buy into the theory that Ford put it there for nothing. They are too cheap, it would not be there unless it did something.

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  #4  
Old 05-07-2001, 12:32 PM
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Question

After some digging I have found the same answer, the big plug is power and speaker. Does anyone have a clue to what the small plug is? Speed control is possibe but it has to run more?

Thanks
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  #5  
Old 05-07-2001, 02:12 PM
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its for the cd changer isn't it?
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  #6  
Old 05-07-2001, 06:09 PM
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Question

Someone has suggested that it goes to a cd changer, but since I dont have one, would it still be there?

Thanks
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  #7  
Old 05-08-2001, 02:08 AM
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I dont have a changer nor does my CD player have changer controllers. I cannot see Ford installing a wire for that. I would think it would have to be to the speedometer or computer.

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  #8  
Old 05-08-2001, 02:23 AM
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Hey guys, I work in a truck factory building what use to be Ford's class 8 trucks. We install the same radios in our rigs as are in my 2000 F-150 and you guys are right about the large plug being power and speakers, and the little plug is part of the amp and cd controls. As for it being in some trucks and not being used, well for all of you guys who think Ford is cheap they are but all the electrical harnesses are generic and it saves money only having one harness with every option on it then to have 10 or more seperate harnesses. Plus it saves up valueble shop space for stocking it at the factories. So for those of you who have a base stereo and want to upgrade and the dealership says it'll cost you an arm and leg. Just go to the wreckers and see if they have any late model F-150's with the stereo's still in tack then you can do it yourself.

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  #9  
Old 05-08-2001, 11:03 PM
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Cool

It's for the CD. It's cheaper to install it in all of them than to have specific harnesses for each radio. Example, my Mustang coupe has a convertible top wiring harness under the console. And all of the new radios have the amp in the head unit.

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  #10  
Old 05-09-2001, 08:52 PM
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Ok then what are the two covered openings on the back of the stereo for? That are plastic and resemble the other two as if there is an identical stereo with two other plugs such as for the amp and the cd changer.

I looked at the wiring diagram in my Haynes manual and they do not go to the changer...incorrect colors and number of wires.

Where do you think the radio gets your speed data so it can turn down the radio when you slow down? Three of those wires that are together in a seperate area in the plug in question match the three in my wiring guide for the speed control. I will plug in my meter while driving to test this theory.

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  #11  
Old 05-10-2001, 12:16 AM
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Cool

Why not jsut get an wiring harness and forget about the other plug? Do you want to put in a factory changer or something?
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  #12  
Old 05-17-2001, 03:41 AM
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Hey Gator...

Could you let me know what you find out with that wire voltage vs. driving speed??... That would be a terrific place for me to tap off of the truck electrical to get the speed so I can build a trip computer for my XLT. Thanks

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  #13  
Old 05-17-2001, 11:04 AM
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Speed sensor is definately a part of that plug. I haven't been able to figure out the rest. I am guessing it's either for the changer option, or amp. I don't use it with my replacement Clarion deck, so can confirm it's not really necessary for anything.
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  #14  
Old 06-01-2001, 09:20 PM
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In some Ford vehicles the plugs you are talking about are for the Premium Sound System that Ford uses. I have done several installs on cars with these and they are a pain to bypass. More than likely if you have one of these systems you have a factory amp in the truck somewhere. You can buy a harness for these systems that will allow you to put an aftermarket head unit in the truck. You local Best Buy or car audio dealer should have them, get Metra if possible. Hope this sheds some light on the matter.

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  #15  
Old 06-04-2001, 05:07 PM
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Your harness will only connect to one of the plugs on the factory HU. The other one is a square plug which your harness will not fit because it is not used.

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Old 06-04-2001, 05:07 PM


 
 
 
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