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Re: 89 Ford Thunderbird, tail lights done' work
An 89, that old enough that oxidation could be a problem.
I'd start by separating all the connectors you can get to, unfortunately there may be one over the gas tank. You can take a light and see if there is one by having someone pull and release the tail light wire as you look. Thoroughly clean each end of the connector until you can see a little copper show. If it looks like there was grease on the connector, apply some dielectric grease before you reconnect the wires.
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Just had same issue with my 01 sport trac. Just purchased truck an never noticed until several days later had no tail lights. Brake light on cab worked not on bed. After days of head banging an scratching I realized when steering wheel was tilted up had lights down no lights tore into steering column was an easy easy fix. The clip tht holds harness in place on top of cold was broke an plug had slid out a bit so pushed it in good an tight zip tied it for temp fix vuala tail lights! Wanted to share so if anyone else has issue they didn't have to spend days scratching their head!
The turn signals and brake lights use the same circuit and filament in the bulbs. The tail lights are on the other circuit which comes from the headlight switch. Do you have power on the tail light fuse ?
sounds more like a short (joined) circuit, probably at the tail lights since they never work. look for melted or damaged wires back there. had any work done back there recently (maybe for towing lights?)
Check the brake light switch located under the dash, connected at the junction where the master cylinder rod connects to the brake pedal. Remove the connector and with a short piece of wire, paper clip works fine, insert into the two terminals on the connector. Check to see if your brake lights are on. If they are, your switch is bad.
oh yes,, believe me you have just enter the pits of hell..
i have a 1990 thunderbird and your lights and **** are all right there with the stereo wiring my dash lights went out and it took forever to figure out how to get them back on good-luck ray
if you need me just holler
Brake light switch, located on upper brake pedal should be checked, that is most likely your brake light issue, but U say tail lights aren't working, but running lights do, tail lights and running lights I would consider to be the same, so can u clarify that for me? Let me know how the u do w/ brake light switch, and if u have issue w/ tail lights?