Check the grounds in your parking lights. Sounds like you have a poor ground and the circuit is completing through the bright filament.
Both filaments use the same ground, so if the ground is non-existent, the current will flow back through the other filament into the turn signal circuit.
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[This message has been edited by cjlandry (edited 11-21-2002).]
Are all the outside lights working ok? Brake, running, and turn signal lights? Do the four way flashers work ok? No other problems seen I would try changing the turn signal flasher can. It's under the dash between the column and radio. Buy a $3.00 cheap one from the auto parts store.
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