Take apart the bulb holder in one taillight and take pix of the bulb and the wire harness. I can tell you exactly what's going on.
You probably have 1156 vs. 1157 bulb. Look at the inner bulb and you should see dual filament with 3 wires going into.
Depending upon what your setup looks like, you need to replicate that setup on the outside. The parking light power lead should go to the low intensity filament, and the brake power lead go to the high intensity filament. Both can share a ground wire.
You may need to swap out the bulb holder. I'm not sure until I see pix.
If in doubt, take the taillight into a good auto parts store and they should be able to help you with bulbs, bulb holder, and wiring.
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