I have a 88 lincoln town car signature series with the jbl stereo i bought the aftermarket wiring harness for it but there is a grey wire with a black box on it that went to the factory radio how do i hook it up i have the power and that part of the harness done where do i go from there

Question edited for clarity and typo.

1994 Oldsmobile 88 Car Stereo Wire Colors and Locations

https://www.the12volt.com > installbay > stereodetail
1994 Oldsmobile 88 Stereo Wiring. Constant 12V+, Orange. Switched 12V+, Yellow. Ground, Black. Illumination, Gray. Dimmer, Brown. Antenna Trigger, Pink.

Find SCHEMATICS and wiring diagrams here:

2006 lincoln car radio wiring diagram Google Search

and more here (registration required):

1993 Lincoln Town Car Wiring Schematic With Array images Just another...

Lincoln Town Car Audio - Car Radio Removal

Car Stereo Help Lincoln Town Car Audio Remove Replace Install and Stereo...

Finally this:

2006 lincoln car radio repair manual Google Search

Hope this helps!
Anthony

do yourself a favor and get the aftermarket harness

http://bbbind.com/free_tsb.html free wiring diagrams .

Why would you want to do that? Go to crutchfield.com and buy a harness for $25 With or without JBL Sysyem?

http://www.crutchfield.com/g_103000/Vehicle-specific-Wiring-Harnesses.html?tp=2977 Vehicle specific Wiring Harnesses

Check the wiring harness that goes from the body to the door; you might find a few broken wires in there.....

The Amp in the trunk might have blown,
Town Car Radio Wire Diagram
Car Radio Battery Constant 12v+ Wire: Pink/Light Blue
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Black/Light Green
Car Radio Illumination Wire: Light Blue/Red
Car Stereo Dimmer Wire: Blue/Red
Car Stereo Antenna Trigger Wire: Blue
Car Stereo Amplifier Location: Trunk
Car Audio Front Speakers Size: 5? x 7? Speakers
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Orange/Light Green
Left Front Speaker Negative Wire (-): Light Blue/White
Right Front Speaker Positive Wire (+): White/Light Green
Right Front Speaker Negative Wire (-): Dark Green/Orange
Car Audio Rear Speakers Size: 6? x 9? Speakers[img src="http://www.assoc-amazon.com/e/ir?t=modilife-20&l=as2&o=1&a=B00009UHRE" width="1" height="1" border="0" alt="">
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Gray/Light Blue
Left Rear Speaker Negative Wire (-): Tan/Yellow
Right Rear Speaker Positive Wire (+): Orange/Red
Right Rear Speaker Negative Wire (-): Brown/Pink
Check the fuses

Before you cut the wires try Walmart and Auto Zone and look for a Conversion kit. They run about $5 and give you a connector that will fit the factory connection and allow you to add the aftermarket device. I know for a fact they have them for aftermarket radios and I'm pretty sure they have them for a separate CD player if that is what you actually have.

go to Walmart or Radio Shack and pick up a installer kit for your car and year and then all you have to do is plug it in the old plug in your dash and plug it in the new system and you ready to go Michigan Man.

i had the same problem and found out that i bought the wrong harness. there are two styles one for non-amplified and factory amplified.