1991 Explorer. Problem with stereo wiring. | Ford Explorer - Ford Ranger Forums - Serious Explorations

  • Register Today It's free! Once registered you can join the Elite Explorers to eliminate ads from the website.

1991 Explorer. Problem with stereo wiring.


New Member
February 5, 2011
Reaction score
City, State
[email protected]
Year, Model & Trim Level
[email protected]
this is the only wiring diagram I can find:
Car Radio Battery Constant 12v+ Wire: Light Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Red or Black
Car Radio Illumination Wire: Orange/Black
Car Stereo Dimmer Wire: Light Blue/Red
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Blue
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
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 (-): Pink/Light Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Pink/Light Green
Left Rear Speaker Negative Wire (-): Tan/Yellow
Right Rear Speaker Positive Wire (+): Orange/Red
Right Rear Speaker Negative Wire (-): Black/White

everything on it matches up except the speaker wires.
My explorer's speaker wires are:

white orange
white red
purple white
light blue
light blue black

and I have a random unidentified thick red wire.
I have used trial and error with all of the wires, and still cannot get a single speaker to make a sound. I have installed this same head unit in a honda accord, a dodge dakota, and a jeep wrangler without issue. is anyone has any tips they would be greatly appreciated.


Moderator & long time member.
Staff member
Elite Explorer
November 11, 2005
Reaction score
City, State
Brooklyn, NY
Year, Model & Trim Level
88 89 93 95 96 Aerostars


Well-Known Member
January 17, 2008
Reaction score
City, State
Long Island, NY
Year, Model & Trim Level
1994 GMC Yukon 2 Door
What type of OEM stereo was in the truck? Was it the AM/FM/Cassette with a toggle type volume switch? If so, the truck has an external amplifier that needs to be bypassed. The factory amp is behind the passenger side trim in the cargo area, right above the wheel. Here is a link which has pictures of where the amp is located. Crutchfield has a wiring harness that you can use to bypass this amp. Once the amp is bypassed you can use a 9 volt battery to verify speaker connections by quickly touching the wires to the battery. You will hear a pop from the speaker if you have the correct wires.