91 radio
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Posting Guru
Joined: Dec 2008
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From: Sterling, Va
91 radio
Ok im putting in a new head unit and had to get the wiring harrness but when i try it it still doesn't work does anyone have the radio wiring charts as to which one is constant pwr, and switched pwr and if the factory radio had a dinner wire in the harrness? And please if anyone also has the chart for the speaker harrness to that would be greatly appreciated!
Thanks
Kyle
Thanks
Kyle
Posting Guru
Joined: Jan 2002
Posts: 1,346
Likes: 8
From: Baltimore
This scematic is for an 88 but I believe 87-91 trucks used the same radio's.
On the Ford harness end there are two connectors.
One connector is for power, dimmer and power antenna.
The other connector is for the speakers.
On the connector end of the factory harness.
Light Green/Yellow wire is Constant 12 volts = Yellow wire on Head Unit harness
Yellow/Black wire is Switched 12 volts = Red wire on Head Unit harness
Light Blue/Red wire is for Dimmer = Orange/White wire on Head Unit harness
Red wire is ground = Black wire on Head Unit harness
On the Ford harness end there are two connectors.
One connector is for power, dimmer and power antenna.
The other connector is for the speakers.
On the connector end of the factory harness.
Light Green/Yellow wire is Constant 12 volts = Yellow wire on Head Unit harness
Yellow/Black wire is Switched 12 volts = Red wire on Head Unit harness
Light Blue/Red wire is for Dimmer = Orange/White wire on Head Unit harness
Red wire is ground = Black wire on Head Unit harness
