blinking faster is a fail mechanism of newer cars, to let you know that you have blown a bulb.
in older cars with simple flasher can, if one of the wires shorts out, then more current goes thru the flasher can, and it heats up faster and flashes faster.
if all the bulbs are still flashing as normal, then maybe one of the wires/fittings has shorted out??
if the parkers stayed on, then they are accidentally getting power from somewhere.
the ground side is thru the body, so it doesn7t matyter if they are accidentalyl getting grounded after the bulb... the short must be before the bulb on the power side.
i would first look at the light switch itself.. maybe it is borked internally..
then i would start looking at the wires running from switch to each light and see if any have chafed thru or melted....
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