No sound out of speakers.

It sounds like the battery has gotten wet .To the best of my Knowledge there are no replacement parts (circuit board) for the batteries.

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

Constant 12V+ Green/Purple

Switched 12V+ Yellow/Black

Ground Black/Light Green

Illumination Light Blue/Red

Dimmer n/a

Amplifier Remote Blue

Antenna Right Front

Front Speakers 5" x 7" Doors

Left Front (+) Orange/Light Green

Left Front (-) Light Blue/White

Right Front (+) White/Light Green

Right Front (-) Dark Green/Orange

Rear Speakers 5" x 7" Rear Doors

Left Rear (+) Gray/Light Blue

Left Rear (-) Tan/Yellow

Right Rear (+) Orange/Red

Right Rear (-) Brown/Pink

best wishes

cannot find 97 but found 98. Do these match?

1998 Mercury Mountaineer Car Audio Wiring Schematic
Car Radio Battery Constant 12v+ Wire: Light Green
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Light Blue/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Blue
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 6? x 8?
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 (+): Dark Green/Orange
Right Front Speaker Negative Wire (-): White/Light Green
Car Audio Rear Speakers Size: 6? x 8?
Car Audio Rear Speakers Location: Rear Doors
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

For 1995 Ford Explorer Car Stereo check this Wiring Diagram...

Car Radio Constant 12v+ Wire: Green/Violet
Car Radio Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Black/Light Green
Car Radio Illumination Wire: Light Blue/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: Orange/Blue
Car Stereo Amp Trigger Wire: Blue (If Equipped)
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
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 (-): Dark Green/Orange
Rear Speakers Size: N/A
Rear Speakers Location: N/A
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

Good luck.

1996 Ford Thunderbird Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Black/Orange
Radio Ignition Switched 12V+ Wire: Yellow/Black
Radio Ground Wire: Black/Light Green
Radio Illumination Dimmer Wire: Light Green
Radio Antenna Trigger Wire: N/A
Radio Amplifier Trigger Wire: Dark Blue
Front Speakers Size: 5′ x 7′
Front Speakers Location: Doors
Left Front Speaker Wire (+): Orange/Light Green
Left Front Speaker Wire (-): Light Blue/White
Right Front Speaker Wire (+): White/Green
Right Front Speaker Wire (-): Green/Orange
Rear Speakers Size: 5′ x 7′
Rear Speakers Location: Side Panels
Left Rear Speaker Wire (+): Gray/Light Blue
Left Rear Speaker Wire (-): Tan/Yellow
Right Rear Speaker Wire (+): Orange/Red
Right Rear Speaker Wire (-): Brown/Pink

1997 Ford Windstar Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Green/Violet
Car Radio Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Black/Light Green
Car Radio Illumination Wire: Green
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
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 (-): Dark Green/Orange
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Light Brown/White
Left Rear Speaker Negative Wire (-): Light Brown/Yellow
Right Rear Speaker Positive Wire (+): Light Brown/Green
Right Rear Speaker Negative Wire (-): Brown/Pink

hope this is the one your looking for pls rate

1997 Ford Windstar Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Green/Violet
Car Radio Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Black/Light Green
Car Radio Illumination Wire: Green
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
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 (-): Dark Green/Orange
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Light Brown/White
Left Rear Speaker Negative Wire (-): Light Brown/Yellow
Right Rear Speaker Positive Wire (+): Light Brown/Green
Right Rear Speaker Negative Wire (-): Brown/Pink

96 and 97 are the same

2000 Hyundai Elantra Stereo Wiring Constant 12V+ Light Green Switched 12V+ Brown Ground Black Illumination Dark Green/White Dimmer Dark Green/Black Antenna Left Rear Front Speakers 5 1/4" Doors Left Front (+) Green/Red Left Front (-) Light Green/White Right Front (+) Red/Blue Right Front (-) Light Green/Black Rear Speakers 6" x 9" Rear Deck Left Rear (+) Yellow/White Left Rear (-) Yellow/Blue Right Rear (+) Green Right Rear (-) Green/Blue

Battery LIGHT GREEN (+)
Accesory BROWN (+) RADIO HARNESS
Ground BLACK (-) RADIO HARNESS
Illumination DARK GREEN/WHITE (+) RADIO HARNESS
Dimmer DARK GREEN/BLACK (+) RADIO HARNESS
LF Speaker (+) GREEN/RED
LF Speaker (-) LIGHT GREEN/WHITE
RF Speaker (+) RED/BLUE
RF Speaker (-) LIGHT GREEN/BLACK
LR Speaker (+) YELLOW/WHITE
LR Speaker (-) YELLOW/BLUE
RR Speaker (+) GREEN
RR Speaker (-) GREEN/BLUE