I replaced the multifunction switch on my 2004 Silverado because the flasher, high beam, and high windshield wiper didn't work. All the information I found indicated the problem was probably a faulty multifunction switch.

A new multifunction switch did NOT solve the problem.

Any suggestions as to what to test or replace?

Thank you in advance for your input.

 

Start from the beginning. Check all the fuses and relays. Then check the wiring for open or shorted circuits.