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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.
Lets start at the beginning. The turn signals and brake lights use different fuses but both go thru the turn signal switch and use the same bulbs. Have you checked the fuses for each circuit and does each switch have power in and out ?
The turn signal flasher relay is located on the driver's side of the steering column, under the dash, mounted in the upper left corner of the fuse panel. It has only one flasher relay for both turn signals and hazard lights.
If the fuses are good and the front and rear bulbs are good, change the flasher for the turn signals, even tho the right is working. If that doesn't fix the problem, it might be in the turn sgnal switch on the steering column.
If both bulbs are good for the backup lights and fuses are good, then the backup light switch, which is screwed into the side of the transmission has to bad.