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Dan----------not saying brakes had anything to do with it-I have seen this type malfunction on numerous fiberglass cars----you have a ground problem ( short? )it is in a wire off of either one of the left lights- if you have good brake lights ( remember the turn signal is by interrupting the element for the brake light)
Go to the rear light ( inside trunk ) and take the bulb out of the socket-see if the fuse blows---------
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