Doug57,
I am not familiar with what type of switch this truck has. Is it a column add-on type, or a factory, under the steering wheel type?
I found schematics for the Signal-Stat aftermarket type, and looking at the wiring diagram, it looks like it would have to be a open contact issue.
Could you flick the switch with "vigor", or shoot it with contact cleaner and see if this produces any positive results..non-flammable only!
Stuart
