95 s10 no brake lights. Turn signals work 4 ways work all other lights work.I have taken plug loose on fire wall powered lights to rear of truck everything works fine.I have replaced 2 new brake light switches and 2 new multifunction switches. Is there a way to test the multifunction switch?
There are 4 identical relays inside the engine compartment right below the passenger windshield wiper. One of them might be blown out. I had the same problem you have and solved it with a $10 relay. Can' remember which one it was.