Hi Chuck,
Welcome to the forum. Sorry that your first contact had to be with a problem but maybe we can help.
Your's is the most difficult of problems to diagnose by mail. The fact that some of the wiring may not be correct or is defective precludes the usual logical analysis. We are left trying to guess what "could be" wrong with the wiring as well as the usual problems. Can you give a little more info?
1- If the turn lights are on & blinking, does turning on park lights cause the blinking lights to just stay steadily on, or do they go out?
2- as above, does an additional light come on or does the intensity change?
3- If the parklights are on first & you turn on the blinkers, what happens?
Since I don't know what your skill level is concerning things automotive electrical I'm not sure how to proceed yet.
The corner lamps should have type 1157 or equivalent bulbs. This is a two element bulb with the park lamp section having about 7 watts output. The turn lamp portion, & on the back, the turn-stop portion has 15 watts output.
There are three wires to each bulb socket. One for ground, one for turn (high output), & one for park (low output). The colors should be black for the four bulb grounds. The remaining colors for the turn lamp portion of the bulbs should be - Left front = grn/red, - Right front = grn/white. Left rear = wh/purple, - right rear = wh/brown. Remember that these go to the higher wattage portion of the bulbs. The colors for the park lamp portion of the bulb are LF = red, RF = red, LR = red, RR = red. The rear license lamp is also red with a black ground. I THINK that these colors are correct for your car. If not, let us know.
If you can answer the above questions it will help to pinpoint the problem.
D