How to fix blinkers in a 2008 389 Peterbilt . Checked fuses checked the switch. What else is there to check? Emergency flashers work just turn signals don't.

If your brake lights are working, then the wiring to the turn signals are good. Check the turn signal flasher which is under the dash. Try your emergency flashers. Do they work?

1. Do your emergency flashers work?
Check all your fuses, make sure they are getting a good contact.
If your emergency flashers work, it may be a faulty turn signal switch.
If your emergency flashers work that will eliminate the flasher. The one flasher works both turn and emergency signals.

My guess would be the turn signal switch. A mechanic would check for voltage there.

Sounds like the flasher unit to me. Normally the emergency flasher and turn signal are separate.

Sounds like a multifunction switch, work the emergency flasher button up and down a few times, then attempt to work the turn signals if the signals work then you will need a multifunction switch.

While not likely, it is possible that the light bulbs in both sides are have bad filaments. Turn on ignition key (but don't start engine). Then turn on parking lamps (first detent or "click" on headlamp switch). Walk around car and look for illumination on front parking lamps and rear tail lights. Turn on the right turn signal. Are those (right hand) lamps now changing brilliance? Try the left turn signal in the same manner. Are those (left hand) front and rear lights changing briiliance? Take note of any positions that did NOT change briliance when the turn signals were activated. If NONE changed briliance, you either have a bunch of bad bulbs (unlikely) or a bad flasher (more likely) or a bad turn signal switch (most likely) or perhaps wiring problems (possible if the car has been in a collision or has been "worked on" by some "non-expert" mechanic). Check the action of the emergency flasher control switch located on the steering column (facing up). Pushing it in (down) should result in the button going to two different heights alternately (low, high, low, high). You could just have bad flashers or corroded flasher contacts! Good luck!

Your F--150 has 2 flashers, emergency and turn signal. Both are mounted on the fuse block under the dash. The turn signal flasher is mounted on the front of the fuse panel, the emergency flasher is mounted on the rear of the fuse panel. so replace the turn signal flasher should solve the problem. Let me know how it goes.

ok, the dash does not show the blinker is on, did you check the front and back to see if any of the turn signals were on, but not blinking? Also the side marker lights should light up if the turn signals aren't working, do they? Let me know. Next check the fuse box, it's on the driver side, under the dashboard. The fuses will be labeled, check the fuse for the turn signals.
Check to see if it"s blown. If it is, or you aren't sure, replace it with one of the same amperage (the # of amps is on the fuse). The fuses can just be pulled out to check them. If you still don't have working blinkers, go back to the fuse block under the dash. There are 2 round canister shaped units plugged into the fuse block. One of them is the turn signal flasher. They are about the diameter of a quarter, and a bit over an inch thick. If your emergency flashers are working, unplug one of the flashers. If they don't work after unplugging one, then you just unplugged the emergency flasher, so the other one is the turn signal flasher. Replace with a new one, identical to the old one. Let me know when you have followed all these instructions and what happens. countrycurt0

Did you check the bulbs? If one bulb is burned out, the blinkers won't word on that side. You could have one bulb burned out on each side. Start the car, put left signal on. Check front and back lights. Is one light on but not blinking? If that's the case, the light that's not on at all is burned out and has broken the circuit so the good light stays on and won't blink. Check the other side. You also have a 'flasher' , actually 2. One for emergency flashers, one for the turn signals. It could be that the turn signal flasher is shot. You just have to unplug it to remove. It's probably located near the fuses. good luck countrycurt0

What other problem did you have before the signals quit? Something that stopped all functions from the signals has to be either a feed or ground IF the flasher is good. Signals feed. Hot wire from the flasher 1 and it should blink underload, but not with a test light or DVM. In other words using a test light the flasher wire should be powered steady. All the rest of the switch is switchable. You should also get a hot wire when the brake pedal is pushed. Check for power at the brake switch,key off.