Led Woes

I have run into an interesting problem on my buddy's '94. We wanted to put LED bulbs in the car, so we started with the rears. After installation of the bulbs, we had stop/turn but no park/tail. Confirmed polarity by reversing the bulbs in the socket, they would not work at all that way. The regular bulbs work perfectly and I cannot find anything wrong with the wiring. The company sent another set of bulbs with a slightly different part number and they acted the same way. Stop/turn but no park/tail. Has anybody else run across this problem with 3157 style bulbs? These are the bulbs ... 4X Pure Red 3157 5050 36 SMD LED Light Bulbs Stop Tail Brake Parking 3057 3457 | eBay

Looking for ideas, all assistance is indeed appreciated.

p.s. We used their 1157 style bulbs in his Camaro and they worked perfectly. The product seems to be of good quality. So, what gives? :p
 
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