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The rapid flashing occurs because of the light problem. If the 20A PARK LP fuse in the underhood fuse block is OK, the front marker lamps and the park lights should turn on when you set the headlamp switch to PARK. If the 10A T/SIG fuse in the instrument panel fuse block is OK, and the ignition switch is on, moving the turn signal multi-function switch to signal a right or left turn should cause the turn signals to flash. If this doesn't happen, check for a missing ground connection to the socket you replaced and check to be sure the replacement lamp was not forced into the socket backwards (it happens).
check the fuse if good then turn on the hazard lights if they work then you probably need a turn signal flasher which is a separate flasher unit then the hazard one.it usually looks like the hazard one so with the hazards on and locate it then you will know what the signal flasher looks like and you will also know not to change the wrong flasher unit.the signal flasher is often located at or near the under dash fuse panel or somewhere in the dash you don`t say what type of car your talking about.
need to check the multi-function switch. the brake light signal goes through the turn signal switch on the steering column. the brake lights come on if the turn signal is not being operated. the circuit for the brake light can loose contact in the switch.
possible multifunction switch gone bad for turn signal problem. do headlihgts come on in a dark setting on automatic or not? if they don't come on when it is dark then most likely bad light sensor in top of dash or maybe unplugged if recent dash work has been done.