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Hi,
It really sounds like one of the rear dual element bulbs is in backward. This doesn't always mean the dim will be swapped with the bright, but more likely the car is using the bulb to cross those wires at the stud(s) on the bottom of the bulb. Rear lights do not function properly if the backing plates are not grounded to the body.
In the front you may have a ground wire that has fallen off and the signals/park lights are using each other as a ground.
Dual element bulbs, installed incorrectly can cause problems right up and into the dash cluster.
Best,
shayne.
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