Dash lights do not work on my 55 Thunderbird

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Not on the 55 model. Your switch may have gone bad. Reach under the dash and press the button on the switch and while holding it pull out the knob from the front. Then you can remove the bezel that holds it in and the switch will come out from the back so that you can work on or replace the switch.
 
John,

If you chose to replace the switch remove one wire at a time and install on the new switch. If you chose to by pass the rheostat, attach a jumper wire from terminal "R" to terminal "I" on the headlight switch. If the rheostat is by passed the dash lights will have full illumination without the benefit of dimming control.

Doug
1955 Thunderbird Blue
 
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