Both turn signal on a 1989 f 150 ford won't work

The dash lights should work in any position. If you mean the warning lights, that and the turn signals go thru the key switch, so that could be a problem with that switch.

Well the brake light and turn signal circuits are on two different fuses, but they both go thru the turn signal switch.
So I would start by checking for power in and out of the turn signal switch for each circuit.

If you replaced the column as a complete unit from a salvage yard, and all of the wiring is connected, the turn signal switch could have been faulty in the used column.
You would need to check for voltage at the fuse and then at the connector for the switch.

turn signal flasher. check your user manual for location and style

If the fuse is good, could be a problem with the switch or the flasher.

try checking the relay and loose damaged wireing to to lights

bad turn signal switch I think

I had the same problem with my 98 and the signal lights switch on the steering column was bad

There are some springs and plastic parts in there which are toggled by a shaft finger. Probably something plastic is broken.

Its not partial repair job, its possibke that you need to replace this multiswitch.

Keep us updated.

Did U replace the turn signal relay switch?