Any idea what hes talking about
 

I'm having similar issue washed my 97 truck and lost turn signals never had hazards and apparently my brake lights may not be working had brake lights and turn signals prior to washing nothing shows up on dash when activated but park lights work

Got a trailer harness on your truck? Do you front turnsignals work?

Is the idiot light turn signal on the dash doing a fast blink or staying on or not even lighting up?

No turn signals
 

Yes factory one and it hasn't been used in 15 years I have park lights but no turn signals at all not even on dash do they show up they worked I washed truck and they didn't work when I left park in lot

don't even light up

check fuses.... also, see if water got into any of the lamp housings.

You say you never had hazards.
I had no turn signals, hazards or brake lights. It turned out to be the multifunction switch. The whole turn hazards and washer unit/switch.

My turn signals didn't work because the click and lock action on my switch broke, and then hazards wouldn't click back to the off position. Make sure the hazards are in the down position. Push it all the way down and then try the turn signals, if they work, replace your multifunction switch.

No turn signals
 

I have a busted turn signal housing up front all fuses are good the switch still clicks and wiper and head light dimmer still work

If it's busted, i would just replace the multifunction switch. Sometimes they can short out partially outside. I still had wipers and such. It's like 50 bucks on rock auto

Also, if you have tilt wheel, the harness is just a bit short.... and if you put the wheel all the way up, it can pull some of the wires out of the connector.