If the tail lights and dash go out at the same time, then I suspect they are on the same circuit. You owners manual should be able to tell you. It sounds like you have a short somewhere. I'd start by tracing the tail light wires.
'88 F150 4x4
'91 Explorer XLT 4x4
'92 Explorer XLT 4x4
'95 Explorer XLT 4x4
If it don't = 16 (4x4), it ain't worth driving...
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