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Well, you're dealing with a short. If the right turn signal only works the right side bulbs, you know you're issue must be in the switch. The only way left turn signal would light the right side, but the right signal would not light the left is if you added a diode, which I doubt is the case. So the switch itself is suspect. That or a wiring issue. If you just bought the truck, and this is an existing issue I'd suspect wiring. If it just started doing this I'd suspect the switch.
I would check to make sure someone didn't monkey with the wires and switch the left turn signal with the hazard lights or something (do your hazard lights happen to flash only the left turn signals?). If it has or had an aftermarket alarm you need to check their work and see what may be screwed up. Alarm systems often tap into the parking lights, which will look like all 4 turn signals, but are actually dimmer filaments. Flashing the parking lights would actually make your radio flash too, so I'm kind of leaning this way. Can't say for sure on limited information though.
there must be alarm fitted that either has the siren disconnected or turned off. Basically sensing an intrusion alert or voltage drop. Flip out the hazard switch, there will be a wire which runs seperate from the body loom into this light, just cut it, the correct one though. if needs be trace it back.....probably end up behind the glove box