My turn signals were working fine since I bought my truck 6 months ago.  It's a 1980 Silverado.  Now, when I drive the truck, the right side turn signals and dash indicator (green arrow) are constantly lit (not blinking).  When I flip the blinker switch to turn right, they flash like normal, but once the switch springs back, the problems continues.  When I flip the switch to turn left, the both sides and indicators flash as if the hazards were engaged.  One other thing....VERY occasionaly, when I flip the switch to turn right, the horn beeps.  Any ideas where I should start....I'm not very knowledgable about electrical stuff.
Thanks,
T.J.