Re: turn signal problem
Could be...however, it could also be that the alternator isn't putting out enough power. My '92 was doing the same thing, and when I bypassed the switch to test the grounds, they acted normally. So, what I would do is bypass the switch with a jumper wire, and see if they work normally. If they do, it could be the switch.
Second thing, take a DVOM (Digital volt/Ohm meter) and test the alternator output with the truck idling. It should be between 13 and 15 volts. If it's right around 13 V, I'd say to replace the alternator, as you can replace the switch, and still have problems because the source of the power for the switch is simply not putting out enough power to power the turn signals.
Billie, my "sparkly" blue 1992 Ranger
SPECS: 2.3 I4; Rebuilt motor at 194,263 miles; straightened driveshaft when engine was rebuilt
FIRST MODS: 2" suspension lift and rear disc brake conversion