make sure you got them hooked up right by your parking/blinker harness, which has the same wire colors like you said. you'll have to take off the bumper and quarter pannel for this (10 min job max)

if you don't do this, feedback is going to occur.. depending on where you tap into your factory wires, its possible to create a bridge causing the other blinker to flash also.

if you don't want to do this, you'll have to use diodes to isolate the power to prevent power from feeding over to the other lightbulb.

btw, this is assuming the sidemarker has a double filament blub.

keep us updated.good luck

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