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Re: i want remove the headlite switch knob.
It doesn't unscrew. If the knob comes off the stem, it is held on by a metal tab inside the hole in the knob. use a pick to depress the tab and pull it off. Otherwise, there should be a spring-loaded button on the headlight switch that you push to pull the knob stem out.
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The speedometer is electronic in this car and it is defective with this type of problem, and you will need to remove the entire cluster from the dash and send it out for repair or find a used one in a salvage yard.
There will be screws/bolts around the outside(under some kind of covers), holding the center section on. after you get that off there will be one nut right in the center(remove that and pull the steering wheel(most of the time you need a steering wheel puller)
1990 Ford Thunderbird Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Green/Yellow Car Radio Accessory Switched 12v+ Wire: Yellow/Black Car Radio Ground Wire: Black/Light Green Car Radio Illumination Wire: Blue/Red Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: Orange/Blue Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: 5′ x 7′ Car Audio Front Speakers Location: Doors Left Front Speaker Positive Wire (+): Orange/Green Left Front Speaker Negative Wire (-): Black/White Right Front Speaker Positive Wire (+): White/Green Right Front Speaker Negative Wire (-): Black/White Car Audio Rear Speakers Size: 5′ x 7′ Car Audio Rear Speakers Location: Side Panels Left Rear Speaker Positive Wire (+): Pink/Green Left Rear Speaker Negative Wire (-): Pink/Blue Right Rear Speaker Positive Wire (+): Pink/Blue Right Rear Speaker Negative Wire (-): Green/Orange
if you go to your local autozone, o'reily, or advanced auto and tell them what you need..a ported vaccum switch they will sell you one and most of the time you can take that and look at it and tell were on top the motor it goes.. i have a 1990 3.8 good-luck ray