No Tail Lights?

Check no.2 on the fuse block see below, if its okay do a voltage check on the brown wire at the taillight socket no power there, its coming from the headlight switch. There's nothing in between the switch and the taillight to prevent it from coming On such as relay etc.

I have the same problem but on my 1996 Ford F-150 xl still haven’t figured it out

This post is for a 1989.

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Cheers, Ken

Electrical problem
1989 Ford F150 V8 Four Wheel Drive Automatic

i have a 89 ford f150 lariat, but the dash light, or turn signal, or tail lights won't work , but i have brake lights,

Hello, as far as the tail lites, I'd check voltage feed to the headlite switch, Also check fuse 4--15amp, check that the fuse circuit is hot. The brown wire at the switch carries voltage to the tail lites, check that wire for voltage, with the switch activated.

Electrical problem
1989 Ford F150 V8 Four Wheel Drive Automatic

my tails lights only went out after connecting trailer lights but it didn't blow any fuses

I can't tell about your trailer wiring connection. For the vehicle, brown wire is voltage for tail lamps, black is ground. Low voltage won't blow a fuse.