[Ron Ramirez]

Clean it, using DeoxIT. This should make your switch work properly.

Don't use the cheap contact cleaners, which may or may not work. If DeoxIT doesn't clean that switch, nothing will.

Spray the contacts with DeoxIT, then turn the switch back and forth several times to allow the DeoxIT to work into the contacts well. Then, let the residue evaporate before you apply power again. DeoxIT evaporates more slowly than some contact cleaners, so allow plenty of time for that and be patient.