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If the fuse blows, you have a dead short to ground somewhere, likely around the tail lights or parking lights. Try this:
Get a box of the correct fuses.
Remove all tail and parking bulbs and put in a new fuse. If the fuse does not blow, try installing each bulb at a time to see which light assembly causes the fuse to blow.
Let's suppose its the RH tail light assembly. Pull it off the car and check for dirt and damaged wiring.
If this is an older vehicle, there may be wiring damage (due to rust) in the harness under the carpets.
There has to be a short or a crossed wire in there somewhere.
You handy with a multimeter?
Check voltages/shorts at the fuse box when the turn signal is on and off while having someone switch the car from park to drive. i'm guessing it's caused by a short or something in common with putting the brake on (because putting the car in drive requires you to apply the brakes first, causing the brake lights to come on, possibly overloading the fuse for the turn signal)
Also check the inside of the area where the signal bulbs are, could be crossed with the brake or shorted in there somewhere.
The bulbs also might have something in common internally, replace the bulbs if you haven't already. I think those bulbs can come on from a signal from the brake pedal (brake lights), but can also be activated by the turn signal.
Good luck with that, let me know how it turns out or if there are any developments