Why did both my head light on my 1993 Ford Thunderbird stop working

SOURCE: 1993 Ford Thunderbird transmission

The transmission is an AOD, the rear differential is either a 7.5" or an 8.8" look at the tag on the rear it should have either 7.5 or 8.8 on it.

Sheilah Say

• 21 Answers
• Posted on Apr 24, 2010

SOURCE: Speedometer works fine but no odometer or trip

You need to replace the VSS or vehicle speed sensor. Located on LH, lefthand rear of transmission.

Sheilah

SOURCE: 1993 ford thunderbird computer location

Here's a pic of the PCM location...





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SOURCE: changed spark plugs in 1993 ford thunderbird 3.8.

double check that you put in the right spark plugs. motorcraft and autolites work well. also make sure that you put the wires on in the proper order. you can find the firing order on line. one more thing is make sure that you didn't crack a spark plug putting them in. Oh and if one of your old plugs have what looks like a black crack in it you have bad wires.

SOURCE: 1993 ford thunderbird head lights went out

I hate to tell you this, based on the amount of work and the expense, but I feel the problem is with the headlight switch/dimmer switch. For all the lights to burn out at the same time would be depressing, at best. Good luck, and I hope you can find a good used one, and a good friend to help you repair this.