Ditto with Van's suggestion. The stalk switch is a funky little nylon rocker that moves the contact reed like a see-saw for hi or low beams. As the contacts age and pit it tends to heat up the reed which heats up a tiny metal ball in the end of the nylon rocker. If it gets hot enough the ball will melt the nylon and the contact is lost. Best bet? Cruise the junk yards. Same switch can be found in amigos and p'up trucks. Also trace back the harness to the fire wall and pull the connector. Blast both ends with electrical contact cleaner and work it in and out a few times to establish a good contact. Lightly applied dielectric grease would be a plus. You'll have to drop the skirt under the steering wheel and maybe pull the drivers side speaker for easy access. It's really low amperage that actuates the relays so even a tiny bit of corrosion in the harness contacts can cause a problem. In fact you may want to check the harness first before you pull the steering wheel to get at the signal switch.