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Howdy,
The following information comes from a Mitchell's Schematic for a 1989 740. I don't have a drawing for a 1990 model. If the colors do not match exactly there should be some wires of the correct color to figure out the remaining wires.
The radio with amplifier is color for color at the connector. The base radio changes color at the connector.
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Base Radio Wire Colors and Connector Pin-out
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Radio.......Color....Connector D......Color........Destination
________________________PIN#____________________________
B+...........BLK.........1..........GRN/RED......Fuse 5
AC+..........BLU.........2............ORG........Fuse 14
ANT..........RED.........3..........GRN/GRY......Power Antenna
LF+........WHT/BLU.......4..........BLU/YEL......LF Door Speaker
RF+..........BLU.........5..........GRY/WHT......RF Door Speaker
BT...........GRY.........6............BLU........Interior Lights
LF-..........WHT.........7............WHT........LF Door Speaker
RF-..........BLU.........8............GRY........RF Door Speaker
GND..........BLK.........9............BLK........Right Kick Panel Ground Point
Radio.......Color....Connector E......Color........Destination
_________________________PIN#____________________________
LR+........YEL/BLK........1.........YEL/BRN......LR Door Speaker
RR+........WHT/BLK........2.........GRN/BRN......RR Door Speaker
LR-..........YEL..........3.........YEL/GRY......LR Door Speaker
RR-..........BRN..........4...........GRN........RR Door Speaker
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Radio With Amplifier Wire Colors and Connector Pin-out
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Radio.......Color.....Connector......Color......Destination
______________________PIN#________________________________
Not Used...............1
Not Used...............2
Not Used...............3
Not Used...............4
Not Used...............5
...........YEL/WHT.....6............YEL/WHT......Interior Lights
.............WHT.......7..............WHT........Interior Lights
.............YEL.......8..............YEL........Interior Lights
..........GRN/RED......9............GRN/RED......Fuse 5
.............BLK......10..............BLK........Right Kick Panel Ground Point
.............ORG......11..............ORG........Fuse 14
..........GRN/GRY.....12....GRN/GRY (2 wires)....Power Antenna
___________________________________________________________
Amplifier...Color.....Connector......Color.......Destination
______________________PIN#_________________________________
GND.........BLK.......1...............BLK........Right Kick Panel Ground Point
LF+.......BLU/YEL.....2.............BLU/YEL......LF Door Speaker
RF+.......GRY/WHT.....3............GRY/WHT.......RF Door Speaker
+BATT.....PNK/BLK.....4............PNK/BLK.......Fuse 26
Not Used..............5
LF-.........WHT.......6..............WHT.........LF Door Speaker
RF-.........GRY.......7..............GRY.........RF Door Speaker
LR+.......YEL/BRN.....8............YEL/BRN.......LR Door Speaker
RR+.......GRN/BRN.....9............GRN/BRN.......RR Door Speaker
Not Used..............10
+BATT.....PNK/BLK.....11...........PNK/BLK.......Fuse 26
LR-.......YEL/GRY.....12...........YEL/GRY.......LR Door Speaker
RR-.........GRN.......13.............GRN.........RR Door Speaker
GND.........BLK.......14.............BLK.........Right Kick Panel Ground Point
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